WO2024151089A1 - Optical system and camera module - Google Patents

Abstract

An optical system according to an embodiment of the present invention comprises first to seventh lenses arranged along an optical axis, wherein: the first lens has negative (-) refractive power; the second lens has negative (-) refractive power; the third lens has positive (+) refractive power; the fourth lens has positive (+) refractive power; the fifth lens has negative (-) refractive power; the sixth lens has positive (+) refractive power; the seventh lens has negative (-) refractive power; a stop is arranged between the second lens and the third lens; and among the first to seventh lenses, the third lens has the largest thickness on the optical axis.

Description

Optics and camera modules

The present invention relates to an optical system for improved optical performance and a camera module including the same.

ADAS (Advanced Driving Assistance System) is an advanced driver assistance system to assist the driver in driving. It senses the situation ahead, judges the situation based on the sensed results, and controls the vehicle's behavior based on the situation judgment. It consists of For example, ADAS sensor devices detect vehicles in front and recognize lanes. Afterwards, when the target lane, target speed, and target ahead are determined, the vehicle's ESC (Electrical Stability Control), EMS (Engine Management System), and MDPS (Motor Driven Power Steering) are controlled. Typically, ADAS can be implemented as an automatic parking system, a low-speed city driving assistance system, and a blind spot warning system.

Sensor devices for detecting the situation ahead in ADAS include GPS sensors, laser scanners, front radar, and Lidar, and the most representative ones are cameras for photographing the front, rear, and sides of the vehicle.

These cameras can be placed outside or inside a vehicle to detect the surrounding conditions of the vehicle. Additionally, the camera may be placed inside the vehicle to detect the situation of the driver and passengers. For example, the camera can photograph the driver from a location adjacent to the driver and detect the driver's health status, drowsiness, drinking, etc. In addition, the camera can photograph the passenger at a location adjacent to the passenger, detect whether the passenger is sleeping, state of health, etc., and provide information about the passenger to the driver.

In particular, the most important element in obtaining an image from a camera is the imaging lens that forms the image. Recently, interest in high performance, such as high image quality and high resolution, is increasing, and research is being conducted on optical systems that include multiple lenses to realize this. However, there is a problem that the characteristics of the optical system change when the camera is exposed to harsh environments, such as high temperature, low temperature, moisture, high humidity, etc., outside or inside the vehicle. In this case, the camera has a problem in that it is difficult to uniformly derive excellent optical and aberration characteristics.

Therefore, new optical systems and cameras that can solve the above-mentioned problems are required.

The embodiment seeks to provide an optical system and camera module with improved optical characteristics.

The embodiment seeks to provide an optical system and a camera module with excellent optical performance in low to high temperature environments.

Embodiments seek to provide an optical system and a camera module that can prevent or minimize changes in optical properties in various temperature ranges.

In order to solve the above technical problem, the optical system according to an embodiment of the present invention includes first to seventh lenses arranged along the optical axis, the first lens has a negative refractive power, and the second lens has negative (-) refractive power, the third lens has positive (+) refractive power, the fourth lens has positive (+) refractive power, and the fifth lens has negative (-) refractive power. wherein the sixth lens has positive (+) refractive power, the seventh lens has negative (-) refractive power, an aperture is disposed between the second lens and the third lens, and the optical axis Among the first to seventh lenses, the third lens may have the greatest thickness.

At least one of the first lens and the third lens may be made of glass, and at least one of the second lens and the fourth to seventh lenses may be made of plastic.

On the optical axis, the sixth lens may have a convex shape on both sides, and on the optical axis, the seventh lens may have a meniscus shape that is convex toward the object.

Among the first to seventh lenses, the absolute value of the focal length of the first lens may be the largest.

From the optical axis to the effective diameter area, the maximum value of the distance between two lenses with the largest Abbe number difference among adjacent lenses may be smaller than the maximum value of the distance between two other adjacent lenses.

The fourth lens and the fifth lens may have the largest Abbe number difference among adjacent lenses.

The conditional expression below can be satisfied. <Conditional expression> 40 < FOV_H < 60 (In the above conditional expression, FOV_H means the horizontal angle of view of the optical system.)

The conditional expression below can be satisfied. <Conditional expression> 0.31< CG1 / ΣCG < 0.5 (In the above conditional expression, CG1 is the distance between the first lens and the second lens on the optical axis, and ΣCG is the sum of the intervals between adjacent lenses on the optical axis.)

The conditional expression below can be satisfied. <Conditional expression> 5 < TTL / ImgH < 7 (In the above conditional expression, TTL is the distance on the optical axis from the vertex of the object side of the first lens to the upper surface of the image sensor, and ImgH is 1/ of the maximum diagonal length of the image sensor. It is 2.)

In order to solve the above technical problem, the optical system according to an embodiment of the present invention includes first to seventh lenses disposed along the optical axis, the second lens has negative refractive power, and the third lens has positive (+) refractive power, the fourth lens has positive (+) refractive power, the fifth lens has negative (-) refractive power, and the sixth lens has positive (+) refractive power. wherein the seventh lens has a negative refractive power, the effective diameter of the second lens is the smallest among the first to seventh lenses, and the effective diameter of the fourth lens is the smallest among the first to seventh lenses. It can be big.

Among the distances between adjacent lenses on the optical axis, the distance between the first lens and the second lens may be the largest.

An aperture is disposed between the second lens and the third lens, and includes a first lens group disposed on an object side with respect to the aperture and a second lens group disposed on a sensor side with respect to the aperture, The sign of the composite focal length of the first lens group and the sign of the composite focal length of the second lens group may be different from each other.

At least one of the lenses disposed on the object side and the sensor side of the aperture may be made of glass.

Among the first to seventh lenses, the absolute value of the focal length of the first lens may be the largest.

The conditional expression below can be satisfied. <Conditional expression> 3 < ΣCT / ΣCG < 4 (In the above conditional expression, ΣCT means the sum of the center thicknesses of the first to seventh lenses on the optical axis, and ΣCG means the sum of the spacing between adjacent lenses on the optical axis. do.)

The optical system and camera module according to the embodiment may have improved optical characteristics. In detail, in the optical system according to the embodiment, a plurality of lenses may have a set thickness, refractive power, and distance from adjacent lenses. Accordingly, the optical system and camera module according to the embodiment can have improved MTF characteristics, aberration control characteristics, resolution characteristics, etc. in a set angle of view range, and can have good optical performance in the periphery of the angle of view.

Additionally, the optical system and camera module according to the embodiment may have good optical performance in a low to high temperature range (-40°C to 105°C). In detail, a plurality of lenses included in the optical system may have set materials, refractive powers, and refractive indices. Accordingly, when the refractive index of each lens changes due to temperature change and the focal length of each lens changes due to this, mutual compensation can be made by the plastic lens and the glass lens. That is, the optical system can effectively distribute refractive power in a temperature range from low to high temperatures, and prevent or minimize changes in optical properties in the temperature range from low to high temperatures. Therefore, the optical system and camera module according to the embodiment can maintain improved optical properties in various temperature ranges.

Additionally, the optical system and camera module according to the embodiment can satisfy the angle of view set through a mixture of a plastic lens and a glass lens and implement excellent optical characteristics. Because of this, the optical system can provide a slimmer vehicle camera module. Accordingly, the optical system and camera module can be provided for various applications and devices, and can have excellent optical properties even in harsh temperature environments, for example, when exposed to the exterior of a vehicle or inside a vehicle at high temperatures in the summer.

1 is a side cross-sectional view of an optical system and a camera module having the same according to a first embodiment.

FIG. 2 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 1.

Figure 3 is a table showing the thickness of each lens and the spacing between adjacent lenses in the optical system of Figure 1.

FIG. 4 is a table showing Sag values of lens surfaces of the first to seventh lenses in the optical system of FIG. 1.

FIG. 5 is a table showing slope angle values of lens surfaces of the first to seventh lenses in the optical system of FIG. 1.

FIG. 6 is a graph showing data on the diffraction MTF (Modulation Transfer Function) of the optical system of FIG. 1 at room temperature.

FIG. 7 is a graph showing data on aberration characteristics of the optical system of FIG. 1 at room temperature.

FIG. 8 is a graph showing data on the diffraction MTF of the optical system of FIG. 1 at low temperature.

FIG. 9 is a graph showing data on aberration characteristics of the optical system of FIG. 1 at low temperature.

FIG. 10 is a graph showing data on the diffraction MTF of the optical system of FIG. 1 at high temperature.

FIG. 11 is a graph showing data on aberration characteristics of the optical system of FIG. 1 at high temperature.

FIG. 12 is a graph showing the peripheral light ratio of the optical system of FIG. 1.

Figure 13 is a side cross-sectional view of an optical system and a camera module having the same according to the second embodiment.

FIG. 14 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 13.

FIG. 15 is a table showing the thickness of each lens and the gap between adjacent lenses in the optical system of FIG. 13.

FIG. 16 is a table showing Sag values of lens surfaces of the first to seventh lenses in the optical system of FIG. 13.

FIG. 17 is a table showing the slope angles of the lens surfaces of the first to seventh lenses in the optical system of FIG. 13.

FIG. 18 is a graph showing data on the diffraction MTF (Modulation Transfer Function) of the optical system of FIG. 13 at room temperature.

FIG. 19 is a graph showing data on aberration characteristics of the optical system of FIG. 13 at room temperature.

FIG. 20 is a graph showing data on the diffraction MTF of the optical system of FIG. 13 at low temperature.

FIG. 21 is a graph showing data on aberration characteristics of the optical system of FIG. 13 at low temperature.

FIG. 22 is a graph showing data on diffraction MTF at high temperature of the optical system of FIG. 13.

FIG. 23 is a graph showing data on aberration characteristics of the optical system of FIG. 13 at high temperature.

Figure 24 is a graph showing the peripheral light ratio of the optical system of Figure 13.

Figure 25 is a side cross-sectional view of an optical system and a camera module having the same according to the third embodiment.

FIG. 26 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 25.

FIG. 27 is a table showing the thickness of each lens and the gap between adjacent lenses in the optical system of FIG. 25.

FIG. 28 is a table showing Sag values of lens surfaces of the first to seventh lenses in the optical system of FIG. 25.

Figure 29 is a table showing the slope angles of the lens surfaces of the first to seventh lenses in the optical system of Figure 25.

FIG. 30 is a graph showing data on the diffraction MTF of the optical system of FIG. 25 at room temperature.

Figure 31 is a graph showing data on aberration characteristics of the optical system of Figure 25 at room temperature.

FIG. 32 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at low temperature of the optical system of FIG. 25.

Figure 33 is a graph showing data on the aberration characteristics of the optical system of Figure 25 at low temperature.

Figure 34 is a graph showing data on diffraction MTF at high temperature of the optical system of Figure 25.

Figure 35 is a graph showing data on the aberration characteristics of the optical system of Figure 25 at high temperature.

Figure 36 is a graph showing the peripheral light ratio of the optical system of Figure 25.

Figure 37 is a side cross-sectional view of an optical system and a camera module having the same according to the fourth embodiment.

Figure 38 is a table showing the aspheric coefficients of lenses in the optical system of Figure 37.

Figure 39 is a table showing the thickness of each lens and the gap between adjacent lenses in the optical system of Figure 37.

Figure 40 is a table showing Sag values of lens surfaces of the first to seventh lenses in the optical system of Figure 37.

Figure 41 is a table showing the slope angles of the lens surfaces of the first to seventh lenses in the optical system of Figure 37.

Figure 42 is a graph showing data on the diffraction MTF (Modulation Transfer Function) of the optical system of Figure 37 at room temperature.

Figure 43 is a graph showing data on aberration characteristics of the optical system of Figure 37 at room temperature.

Figure 44 is a graph showing data on the diffraction MTF of the optical system of Figure 37 at low temperature.

Figure 45 is a graph showing data on the aberration characteristics of the optical system of Figure 37 at low temperature.

Figure 46 is a graph showing data on diffraction MTF at high temperature of the optical system of Figure 37.

Figure 47 is a graph showing data on the aberration characteristics of the optical system of Figure 37 at high temperature.

Figure 48 is a graph showing the peripheral light ratio of the optical system of Figure 37.

Figure 49 is an example of a vehicle having an optical system according to an embodiment of the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining or replacing.

In addition, terms (including technical and scientific terms) used in this embodiment have meanings that can be generally understood by those skilled in the art to which this embodiment belongs, unless specifically defined and described. The meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

Additionally, the terms used in this embodiment are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular may also include the plural unless specifically stated in the phrase, and when described as "at least one (or more than one) of A and B and C", it is combined with A, B, and C. It can contain one or more of all possible combinations.

Additionally, in describing the components of this embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, sequence, or order of the component.

And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, that component is directly 'connected', 'coupled', or 'connected' to that other component. In addition to cases, it may also include cases where the component is 'connected', 'coupled', or 'connected' by another component between that component and that other component.

Additionally, when described as being formed or disposed “on top” or “bottom” of each component, “top” or “bottom” means that the two components are directly adjacent to each other. This includes not only cases of contact, but also cases where one or more other components are formed or disposed between two components. In addition, when expressed as “top” or “bottom,” the meaning of not only the upward direction but also the downward direction can be included based on one component.

In the description of the invention, “object side” may refer to the surface of the lens facing the object side based on the optical axis (OA), and “sensor side” may refer to the surface of the lens facing the imaging surface (image sensor) based on the optical axis. It can mean side. “Object side” may be “water side”, and “sensor side” may be “upper side”. That one side of the lens is convex may mean a convex shape in the optical axis or paraxial region, and that one side of the lens is concave may mean a concave shape in the optical axis or paraxial region. The radius of curvature, center thickness, and optical axis spacing between lenses listed in the table for lens data may refer to values (unit, mm) at the optical axis. The vertical direction may mean a direction perpendicular to the optical axis, and the end of the lens or lens surface may mean the end of the effective area of the lens through which incident light passes. The size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm depending on the measurement method. The paraxial area refers to a very narrow area near the optical axis, and is an area where the distance at which light rays fall from the optical axis (OA) is almost zero. Hereinafter, the meaning of optical axis may include the center of each lens or a very narrow area near the optical axis.

1, 13, 25, and 37, the optical systems 1000, 1100, 1200, and 1300 according to the first to fourth embodiments of the present invention may include five or more lenses. The optical systems 1000, 1100, 1200, and 1300 and camera modules having them may be mounted inside or outside the vehicle to monitor the driver or sense external objects or lanes. The material of the lenses can be glass or plastic, and the coefficient of linear expansion of glass is smaller than that of plastic. Accordingly, a glass lens is used to prevent changes in the focal imaging position due to temperature changes. However, glass lenses are more expensive than plastic lenses, and there is a problem in that it is difficult to meet the demand for lower costs. Accordingly, the lenses in the optical systems 1000, 1100, 1200, and 1300 are required to be a mixture of glass lenses and plastic lenses. By employing these plastic lenses, the optical system (1000, 1100, 1200, 1300) can reduce the thickness of the plastic lenses, providing lighter weight and lower costs, and the plastic lenses prevent various aberrations such as spherical aberration and chromatic aberration. Good correction may be possible. Additionally, since plastic lenses can provide aspherical lenses, distortion in the peripheral area can be minimized.

The optical system (1000, 1100, 1200, 1300) may include n lenses, the nth lens may be the last lens adjacent to the image sensor 500, and the n-1th lens may be the lens closest to the last lens. . n is an integer of 6 or more, for example, may be 6 to 8. The n lenses may have a ratio of glass lenses and plastic lenses ranging from 2:5 to 3:4.

At least one lens closest to the object within the optical system (1000, 1100, 1200, and 1300) may be made of glass. Two or fewer lenses closest to the object, for example, one lens may be made of glass. Since glass lenses have a smaller rate of change in contraction and expansion due to temperature changes than plastic lenses, glass lenses can be placed in an area adjacent to the outside of the lens barrel.

At least one lens disposed adjacent to the aperture STOP in the optical systems 1000, 1100, 1200, and 1300 may be made of glass. The lens disposed closest to the aperture (STOP) on the sensor side of the aperture (STOP) may be made of glass. Since the lens placed adjacent to the aperture (STOP) is a lens with great influence in the optical system (1000, 1100, 1200, 1300), the lens made of glass can be placed so that the rate of change in contraction and expansion due to temperature change is small.

At least one lens closest to the image sensor 500 within the optical systems 1000, 1100, 1200, and 1300 may be made of plastic. For example, at least two lenses closest to the image sensor 500 may be made of plastic, and preferably, at least two lenses adjacent to the image sensor 500 may be made of plastic. That is, since the n-th and n-1-th lenses in the optical systems 1000, 1100, 1200, and 1300 are disposed as plastic lenses, various aberrations of light on the incident side of the image sensor 500 can be corrected.

Within the optical systems 1000, 1100, 1200, and 1300, lenses made of plastic may be continuously arranged, and lenses made of glass may be arranged continuously. Within the optical systems 1000, 1100, 1200, and 1300, lenses made of plastic may be disposed between lenses made of glass. Within the optical systems 1000, 1100, 1200, and 1300, lenses made of glass may be disposed between lenses made of plastic.

Each lens (101-107, 201-207, 301-307, 401-407) may have an object side and a sensor side. In an optical system, the number of lenses with an aspherical sensor side and an aspherical object side may be greater than the number of plastic lenses. In an optical system, the number of lenses with a spherical sensor side and a spherical object side may be smaller than a lens with aspherical surfaces on both sides. Since the optical systems (1000, 1100, 1200, and 1300) are equipped with more aspherical lenses than spherical lenses, various aberrations can be corrected.

Among the lenses of the optical system (1000, 1100, 1200, and 1300), the lens with the maximum refractive index may be located adjacent to the object. The maximum refractive index may be 1.6 or more. The color dispersion of incident light can be increased by a lens with the highest refractive index, and the center thickness can be thinner than the edge thickness. Additionally, since the lens with the maximum refractive index is disposed on the object side, it is easy to change the radius of curvature of the second and subsequent lenses and the center thickness can be increased.

As shown in FIGS. 1, 13, 25, and 37, the optical systems (1000, 1100, 1200, and 1300) according to the first to fourth embodiments of the invention may include a plurality of lens groups (LG1 and LG2). . In detail, each of the plurality of lens groups LG1 and LG2 includes at least one lens. For example, the optical systems 1000, 1100, 1200, and 1300 include a first lens group (LG1) and a second lens group (LG2) sequentially arranged along the optical axis (OA) from the object side toward the image sensor 500. may include. The optical system (1000, 1100, 1200, 1300) may include n lenses, the nth lens may be the last lens, and the n-1th lens may be the lens closest to the last lens. n is an integer of 5 or more, for example, may be 5 to 9.

The optical system (1000, 1100, 1200, 1300) consists of a first lens group (LG1), which is a plurality of lenses arranged on the object side based on the aperture (STOP), and a plurality of lenses arranged on the sensor side based on the aperture (STOP). may include a second lens group (LG2). The number of lenses for each of the first lens group (LG1) and the second lens group (LG2) may be different. The number of lenses in the second lens group (LG2) may be greater than the number of lenses in the first lens group (LG1).

The first lens group LG1 may include at least one lens. The first lens group LG1 may have three or fewer lenses. The first lens group LG1 may preferably include two lenses. The second lens group (LG2) may include four or more lenses. The second lens group (LG2) may have 5 lenses.

The composite focal length of the first lens group (LG1) can be defined as F_LG1, and the composite focal length of the second lens group (LG2) can be defined as F_LG2. The signs of F_LG1 and F_LG2 may be different. F_LG1 can have a negative (-) value, and F_LG2 can have a positive (+) value. Through this, light can be spread from one of the two lens groups and then collected from the other lens group. The difference between the absolute value of the composite focal length (F_LG1) of the first lens group (LG1) and the absolute value of the composite focal length (F_LG2) of the second lens group (LG2) may satisfy the range of 1 to 3.

The aperture (STOP) is disposed between the second lens (102, 202, 302, 402) and the third lens (103, 203, 303, 403), and the first lens group (LG1) includes first to second lenses (101-102, 201-202, 301-302, 401-402). And the second lens group (LG2) may include third to seventh lenses (103-107, 203-207, 303-307, and 403-407). The composite focal length of the first lens group (LG1) has a negative (-) sign, and the focal length of at least one of the first lenses (101, 201, 301, 401) and the second lenses (102, 202, 302, 402) is the same focal length as the first lens group (LG1). It can have a sign of . In the first lens group LG1, the Abbe number of the lens having the same sign as the sign of the composite focal length of the first lens group LG1 may be 40 or more. The Abbe numbers of the first lenses (101, 201, 301, 401) and the second lenses (102, 202, 302, 402) may be 40 or more, and may preferably satisfy the range of 50 to 70. Through this, aberration of light passing through each lens can be removed. However, as an exception, lenses with relatively small refractive power may have an Abbe number of 40 or less.

The composite focal length of the second lens group (LG2) has a positive (+) sign, and the focal length of at least one of the third lenses (103,203,303,403), fourth lenses (104,204,304,404), and sixth lenses (106,206,306,406) is the second lens group. It may have the same sign of the focal length as (LG2). In the second lens group LG2, the Abbe number of the lens having the same sign as the sign of the composite focal length of the second lens group LG2 may be 40 or more. The Abbe number of at least one of the fifth lenses (105, 205, 305, 405), the sixth lenses (106, 206, 306, 406), and the eighth lenses (108, 208, 308, 408) may be 40 or more. Through this, aberration of light passing through each lens can be removed. However, as an exception, lenses with relatively small refractive power may have an Abbe number of 40 or less.

Within the optical systems 1000, 1100, 1200, and 1300, a lens having a maximum effective diameter may be placed at the center of the object side and the sensor side. As you move from the object side to the sensor side, the effective diameter of the lens can increase and then decrease. As you move from the object side to the sensor side, the effective diameter of the lens may become smaller, then larger, and then smaller again. Through this, since the light incident on the optical systems (1000, 1100, 1200, and 1300) moves away from the optical axis and then gathers back toward the optical axis, the optical systems (1000, 1100, 1200, and 1300) can form a stable optical path.

The effective diameter may be the diameter of the effective area where effective light is incident on each lens. The effective diameter is the length in the direction (X, Y) perpendicular to the optical axis, and is the average of the effective diameter of each lens on the object side and the effective diameter on the sensor side. “Diameter of the lens surface” may mean “effective diameter of the lens.” The “diameter of the lens” may be the diameter of the entire lens including the flange portion of the lens in addition to the effective area of the lens. Although the flange of the lens is not shown in FIGS. 1, 13, 25, and 37, the flange may be a part that protrudes from the side of the lens in a direction perpendicular to the optical axis in order to couple the lens to the barrel. The flange may not allow effective light to enter. In order for the lens to be coupled to the barrel, spacers may be additionally disposed between the flanges of different lenses.

Each of the lenses 101-107, 201-207, 301-307, and 401-407 may include an effective area and an unactive area. The effective area may be an area through which light incident on each of the lenses passes. In other words, the effective area can be defined as an effective area or effective diameter in which the incident light is refracted to realize optical characteristics. The non-effective area may be placed around the active area. The non-effective area may be an area where effective light is not incident from the plurality of lenses. In other words, the non-effective area may be an area unrelated to optical characteristics. Additionally, the end of the non-effective area may be an area fixed to a lens barrel or the like that accommodates the lens.

The total top length (TTL) within the optical systems (1000, 1100, 1200, and 1300) may be 5 times greater than Imgh, for example, 6 times or more and 8 times or less. Total track length (TTL) is the distance on the optical axis (OA) from the center of the object side of the first lens to the image surface of the image sensor 500. Imgh is 1/2 of the maximum diagonal length of the image sensor 500. Within the optical system (1000, 1100, 1200, 1300), the effective focal length (EFL) is over 9 mm and the horizontal angle of view (FOV_H) is between 145 and 160 degrees, and is provided as an optical system for monitoring inside the vehicle in the vehicle camera module. can do. For example, the optical system and camera module according to the embodiment may be applied to a camera for an Advanced Driving Assistance System (ADAS) installed inside or outside a vehicle.

The optical system (1000, 1100, 1200, 1300) may have a TTL/Imgh condition of 5 or more and 7 or less, for example, 5.5 or more and 6.5 or less. The optical system (1000, 1100, 1200, 1300) sets the TTL/Imgh value to 5 or more and 7 or less, thereby providing a lens optical system for a vehicle. Accordingly, the optical systems 1000, 1100, 1200, and 1300 can provide images without exaggeration or distortion.

The effective diameter of at least one plastic lens within the optical system 1000, 1100, 1200, and 1300 may be smaller than the length of the image sensor 500. The effective diameter is the diameter or length of the effective area where light is incident. The length of the image sensor 500 is the maximum length of the diagonal in the direction perpendicular to the optical axis OA. Within the optical system (1000, 1100, 1200, 1300), the number of lenses with an effective diameter larger than the length of the image sensor 500 is 65% or more or 75% or more, and the number of lenses with an effective diameter smaller than the length of the image sensor 500 is It may be less than 30% or less than 25%.

The lens unit may be a mixture of glass lenses and plastic lenses. The number of lenses made of plastic may be 60% or more, and may range from 65% to 85%, compared to the total number of lenses. Accordingly, if more plastic lenses are placed within the camera module, the weight of the camera module can be reduced, and the plastic material makes it easy to polish and process, has strong external impact, and is highly price competitive and easy to secure materials. Additionally, various aberrations can be corrected using plastic lenses, preventing degradation of optical performance.

Embodiments of the invention can reduce the weight of the camera module by further mixing plastic lenses in the optical system (1000, 1100, 1200, and 1300), provide a cheaper manufacturing cost, and provide optical stability according to temperature changes. Deterioration of properties can be suppressed, various types of plastic lenses can replace glass lenses, and polishing and processing of lens surfaces such as aspherical surfaces or free-form surfaces can be easy.

The effective diameter of the lens closest to the object within the lens unit may be larger than the effective diameter of the lens closest to the image sensor 500. Accordingly, the brightness of the optical system can be controlled. The effective diameter may be the average effective diameter of the object side and the sensor side of each lens. By controlling the effective diameter size of each lens, the optical system (1000, 1100, 1200, and 1300) can control incident light to compensate for degradation in resolution and optical characteristics due to temperature changes, and improve chromatic aberration control characteristics. The vignetting characteristics of the optical system (1000, 1100, 1200, and 1300) can be improved.

The lens unit includes a first lens (101, 201, 301, 401), a second lens (102, 202, 302, 402), a third lens (103, 203, 303, 403), a fourth lens (104, 204, 304, 404), and a fifth lens (105, 205, 305, 40) aligned along the optical axis from the object side to the sensor side. 5), It may include a sixth lens (106, 206, 306, 406) and a seventh lens (107, 207, 307, 407).

The lens unit may be disposed in a camera module having an inner barrel on one side or the entire inner surface of the lens barrel. The lens unit may be disposed in a camera module having a plurality of inner barrels around different lenses of the lens barrel. The lens unit may be disposed in a camera module having a first inner barrel in contact with an outer surface of at least one lens of the lens barrel and a second inner barrel in contact with an outer surface of at least one lens. The lens unit may be disposed in a camera module having a plurality of inner barrels, each of which is disposed between the outside of at least one or two lenses and the lens barrel. The lens unit may be disposed in a camera module in which a plurality of inner barrels have a material different from that of the lens barrel.

Among the lenses constituting the lens unit, at least some of the lenses made of glass may be placed on the lens barrel, and at least some of the lenses made of plastic may be placed on the inner barrel disposed within the lens barrel. Through this, the optical systems (1000, 1100, 1200, and 1300) can maintain resolution according to temperature changes. The lens unit is disposed in a camera module having a heterogeneous barrel to minimize decentering of a lens, such as a plastic lens, that expands according to temperature changes. The lens barrel on which the lens unit is disposed has a plurality of inner barrels within the lens barrel, thereby maintaining the resolution of the optical system and suppressing deformation of the lenses due to temperature changes. Accordingly, the effective diameter of at least some of the glass lenses included in the lens unit may be smaller than the effective diameter of at least some of the plastic lenses.

There may be one or more lenses larger than the average effective diameter of the plastic lenses in the lens unit, for example, two or more lenses. The average effective diameter of plastic lenses is PLca_Aver, and if the average effective diameter of glass lenses is GLca_Aver, the condition of PLca_Aver < GLca_Aver can be satisfied. Additionally, the condition of 1.8 < GLca_Aver / PLca_Aver < 2.1 can be satisfied. Additionally, the relationship between the length of the image sensor 500 and the average effective diameter (PLca_Aver) of the plastic lens may satisfy the condition of 1.8 < PLca_Aver/Imgh < 2.1. Additionally, the relationship between the average effective age of the glass material and the length of the image sensor 500 may satisfy the condition of 1.5 < GLca_Aver/Imgh < 2. The difference between the maximum length of the image sensor 500 and the effective diameter of the plastic lens may be arranged to be small. Accordingly, by placing a plastic lens with a small effective diameter adjacent to the image sensor 500, the plastic lenses can disperse color from the center of the image sensor 500 to the periphery.

The average effective diameter of the glass materials may be 8 mm or more, for example, in the range of 9 mm to 11 mm. The average effective diameter of the plastic material may be 8 mm or more, for example, in the range of 9 mm to 11 mm. The lens with the minimum effective diameter may be made of plastic, and the lens with the maximum effective diameter may be made of glass. The minimum effective diameter within the lens unit may be in the range of 7mm to 9mm, and the maximum effective diameter may be in the range of 10mm to 13mm. Plastic lenses are designed to have a smaller effective diameter than glass lenses and are placed so as not to contact the lens barrel, thereby minimizing changes in optical performance due to temperature changes. In addition, the optical systems (1000, 1100, 1200, 1300) can improve resolution and chromatic aberration control characteristics by controlling the incident light, and the vignetting characteristics of the optical systems (1000, 1100, 1200, 1300) can be improved. there is.

The optical system 1000, 1100, 1200, 1300 or the camera module may include an image sensor 500. The image sensor 500 can detect light and convert it into an electrical signal. The image sensor 500 can detect light that sequentially passes through the lens unit. The image sensor 500 may include an element that can detect incident light, such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

The optical system (1000, 1100, 1200, 1300) or camera module may include a filter (600). The filter 600 may be placed between the last lens and the image sensor 500. The filter 600 may be disposed between the image sensor 500 and a lens closest to the sensor among the lenses of the lens unit. For example, the filter 600 may be disposed between the nth lens and the image sensor 500.

The cover glass is disposed between the filter 600 and the image sensor 500, protects the upper part of the image sensor 500, and can prevent the reliability of the image sensor 500 from deteriorating. The cover glass can be removed. The cover glass may be a protective glass.

The filter 600 may include an infrared filter or an infrared cut-off filter. The filter 600 may pass light in a set wavelength band and filter light in a different wavelength band. When the filter 600 includes an infrared filter, radiant heat emitted from external light can be blocked from being transmitted to the image sensor 500. Additionally, the filter 600 can transmit visible light and reflect infrared rays.

The optical systems 1000, 1100, 1200, and 1300 according to the embodiment may include an aperture (Stop). The aperture can control the amount of light incident on the optical system (1000, 1100, 1200, 1300). For lenses disposed between an object and an aperture, the effective diameter of the lens surface tends to increase from the object side to the aperture. For lens surfaces disposed between the aperture and the sensor, the effective diameter of the lens surfaces tends to decrease as it moves from the aperture to the sensor. The fact that the effective diameter of the lens planes tends to increase or decrease does not mean only when the effective diameter of the lens planes increases or decreases. For example, this includes cases where the effective diameter of the lens surfaces increases and then decreases as it moves from the aperture to the sensor side.

In the optical systems 1000, 1100, 1200, and 1300 of the first to fourth embodiments, the sum of the refractive indices of the lenses of the lens unit may be 9 or more, for example, in the range of 10 to 13, and the average refractive index may be in the range of 1.5 to 1.7. The sum of the Abbe numbers of each lens may be 340 or more, for example, in the range of 350 to 380, and the average of the Abbe numbers may be 60 or less, for example, in the range of 45 to 55. The sum of the central thicknesses of all lenses may be 18 mm or more, for example, in the range of 19 mm to 21 mm, and the average of the central thicknesses may be in the range of 2 mm to 3 mm. The sum of the center spacings between the lenses at the optical axis (OA) may be greater than 4 mm, for example in the range of 5 mm to 7 mm, and may be less than the sum of the center thicknesses of the lenses. In addition, the average value of the effective diameter of each lens surface (S1-S14) of the lens unit may be 3 mm or more, for example, in the range of 3.5 mm to 4.5 mm.

In the optical system according to the first to fourth embodiments of the invention, the F number may be 1.8 or less, for example, in the range of 1.5 to 1.7. The horizontal field of view (FOV_H) of the vehicle optical system in the Y-axis direction may be greater than 40 degrees and less than 60 degrees, for example, in the range of 45 degrees to 50 degrees. Additionally, the vertical angle of view may be provided at a smaller angle than the horizontal angle of view. The vertical angle of view (FOV_V) may be greater than 20 degrees and less than 35 degrees, for example, in the range of 25 to 30 degrees. The sensor length in the horizontal direction (Y) may be 8.64 mm ± 0.5 mm, and the sensor height in the vertical direction (X) may be 5.58 mm ± 0.5 mm. The horizontal angle of view (FOV_H) is the angle of view based on the horizontal length of the image sensor, and the vertical angle of view (FOV_V) is the angle of view based on the vertical length of the image sensor. Accordingly, it is possible to suppress changes in the focus imaging position due to temperature changes, and it is possible to provide a vehicle camera in which various aberrations are well corrected.

Since the optical system applied to vehicle cameras usually monitors the situation on the road, the optical system can be designed based on the horizontal angle of view rather than all angles of view. The optical system according to this embodiment is designed with a certain margin based on the inscribed circle of the image sensor. Optical performance can be guaranteed in an area that satisfies the range of horizontal angle of view (FOV_H).

Since the embodiment is an optical system applied to a vehicle camera, the first lenses 101, 201, 301, and 401 can be made of glass even though they are designed using both plastic lenses and glass lenses. This has the advantage that glass material is more resistant to scratches than plastic material and is not sensitive to external temperature. The first lenses 101, 201, 301, and 401 may be glass mold lenses that have an aspherical surface and are made of glass. Glass mold lenses can be produced by placing an optical glass ingot inside a mold that will have an aspherical shape and then heating and compressing it.

In order to more effectively prevent scratches placed inside the vehicle or caused by foreign substances, a glass lens is used as the first lens (101, 201, 301, 401), and the object side of the first lens (101, 201, 301, 401) has a gently curved shape to avoid contact with external structures. You can. Through this, the occurrence of scratches due to contact with external structures can be minimized. For driver monitoring when driving a vehicle, photographing the front/rear of the vehicle, or detecting lanes and unexpected objects around the vehicle, the angle of view may be greater than 40 degrees and less than 60 degrees, for example, in the range of 45 degrees to 50 degrees. This horizontal angle of view may be a preset angle for an advanced driver assistance system (ADAS).

The optical systems 1000, 1100, 1200, and 1300 according to the embodiment may further include a reflection member for changing the path of light. The reflecting member may be implemented as a prism that reflects light incident on the optical system (1000, 1100, 1200, 1300) in the direction of the lenses. Hereinafter, the optical system according to the embodiment will be described in detail.

The optical system according to the first embodiment of the invention will be described.

FIG. 1 is a side cross-sectional view of an optical system and a camera module having the same according to a first embodiment, FIG. 2 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 1, and FIG. 3 is the thickness and thickness of each lens of the optical system of FIG. 1. This is a table showing the spacing between adjacent lenses, Figure 4 is a table showing the Sag values of the lens surfaces of the first to seventh lenses in the optical system of Figure 1, and Figure 5 is a table showing the Sag values of the lens surfaces of the first to seventh lenses in the optical system of Figure 1. It is a table showing the Slope Angle values of the planes, and Figure 6 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at room temperature of the optical system of Figure 1, and Figure 7 is a graph showing the aberration characteristics at room temperature of the optical system of Figure 1. FIG. 8 is a graph showing data on the diffraction MTF of the optical system of FIG. 1 at low temperature, and FIG. 9 is a graph showing data on the aberration characteristics of the optical system of FIG. 1 at low temperature, and FIG. 10 is a graph showing data on the diffraction MTF at high temperature of the optical system of FIG. 1, FIG. 11 is a graph showing data on aberration characteristics at high temperature of the optical system of FIG. 1, and FIG. 12 is a graph showing the surroundings of the optical system of FIG. 1. This is a graph showing the light ratio.

Referring to FIG. 1, the optical system 1000 includes a lens unit, and the lens unit may include a first lens 101 to a seventh lens 107. The first to seventh lenses 101 to 107 may be sequentially arranged along the optical axis OA of the optical system 1000. Light corresponding to object information may pass through the first to seventh lenses 101 to 107 and the filter 600 and be incident on the image sensor 500.

The first lens 101 may be placed closest to the object. The first lens 101 may be placed furthest from the sensor side. The first lens 101 may have negative refractive power at the optical axis OA. The first lens 101 may include a plastic material or a glass material, for example, a glass material. The first lens 101 made of glass can reduce changes in the center position and radius of curvature due to temperature changes in the surrounding environment, and protect the entrance side of the optical system 1000.

Based on the optical axis, the object-side first surface S1 of the first lens 101 may be convex, and the sensor-side second surface S2 may be concave. The first lens 101 may have a meniscus shape that is convex toward the object. The first lens 101 may have a meniscus shape that is concave toward the sensor. The first lens 101 is made of glass and may have an aspherical surface. At least one or both of the first surface (S1) and the second surface (S2) may be aspherical. The aspheric coefficients of the first and second surfaces S1 and S2 may be provided as S1 and S2 of L3 in FIG. 2. At least one or both of the first surface S1 and the second surface S2 may be provided without a critical point from the optical axis OA to the end of the effective area.

Due to the refractive characteristics of the first lens 101, the second lens 102 may be further spaced apart from the first lens 101. That is, the center spacing between the first and second lenses 101 and 102 may be the largest within the lens unit.

The refractive index (n1) of the first lens 101 may satisfy the condition of n1>1.6 or n1>1.62. When the refractive index (n1) of the first lens 101 satisfies the above conditions, the radius of curvature of the first and second lenses 101 and 102 can be increased, and lens manufacturing can be easy. If the refractive index (n1) of the first lens 101 is smaller than the condition, the lens surface must be sharply concave or convex to increase the refractive power of the first and second lenses 101 and 102. In this case, the lens surface must be made sharply concave or convex. It is not easy, and the rate of lens defects increases and may cause a decrease in yield.

The second lens 102 may be disposed second on the object side. The second lens 102 may be placed sixth on the sensor side. The second lens 102 may be disposed between the first lens 101 and the third lens 103. The second lens 102 may have negative refractive power at the optical axis (OA). The second lens 102 may include plastic or glass. For example, the second lens 102 may be made of plastic.

Based on the optical axis OA, the object-side third surface S3 of the second lens 102 may be concave, and the sensor-side fourth surface S4 may be convex. The second lens 102 may have a meniscus shape that is convex toward the sensor. The second lens 102 may have a meniscus shape that is concave toward the object. The second lens 102 is made of plastic and may be aspherical. At least one or both of the third surface S3 and the fourth surface S4 may be aspherical. The aspherical coefficients of the third and fourth surfaces S3 and S4 can be provided as S1 and S2 of L2 in FIG. 2. At least one or both of the third surface S3 and the fourth surface S4 may be provided without a critical point from the optical axis OA to the end of the effective area.

The aperture stop may be disposed around the fourth surface S4 on the sensor side of the second lens 102. The aperture stop may be disposed around the object-side fifth surface S5 of the third lens 103. Aperture can reduce TTL within the range of view angle, and miniaturization of the optical system is possible. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and improve production efficiency. Additionally, the optical system can be miniaturized by reducing the TTL at a horizontal angle of view (FOV_H) of 40 to 50 degrees.

The third lens 103 may be arranged third from the object side. The third lens 103 may be placed fifth on the sensor side. The third lens 103 may be disposed between the second lens 102 and the fourth lens 104. The third lens 103 may have positive (+) refractive power at the optical axis (OA). The third lens 103 may include plastic or glass. For example, the third lens 103 may be made of glass.

Based on the optical axis, the object-side fifth surface S5 of the third lens 103 may be convex, and the sensor-side sixth surface S6 may be convex. The third lens 103 may have a convex shape on both sides. The third lens 103 is made of glass and may be spherical. At least one or both of the fifth surface S5 and the sixth surface S6 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fourth lens 104 may be placed fourth on the object side. The fourth lens 104 may be placed fourth on the sensor side. The fourth lens 104 may be disposed between the third lens 103 and the fifth lens 105. The fourth lens 104 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fourth lens 104 may have positive (+) refractive power. The fourth lens 104 may include plastic or glass. For example, the fourth lens 104 may be made of plastic.

Based on the optical axis, the object-side seventh surface S7 of the fourth lens 104 may be convex, and the sensor-side eighth surface S8 may be convex. The fourth lens 104 may have a convex shape on both sides. The fourth lens 104 is made of plastic and may be aspherical. At least one or both of the seventh surface S7 and the eighth surface S8 may be aspherical. The aspherical coefficients of the seventh and eighth surfaces (S7 and S8) can be provided as S1 and S2 of L4 in FIG. 2. At least one or both of the seventh surface S7 and the eighth surface S8 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fifth lens 105 may be placed fifth on the object side. The fifth lens 105 may be placed third on the sensor side. The fifth lens 105 may be disposed between the fourth lens 104 and the sixth lens 106. The fifth lens 105 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fifth lens 105 may have negative (-) refractive power. The fifth lens 105 may include plastic or glass. For example, the fifth lens 105 may be made of plastic.

Based on the optical axis OA, the object-side ninth surface S9 of the fifth lens 105 may be convex, and the sensor-side tenth surface S10 may be concave. The fifth lens 105 may have a meniscus shape that is convex toward the object. The fifth lens 105 may have a meniscus shape that is concave toward the sensor. The fifth lens 105 is made of plastic and may be aspherical. At least one or both of the ninth surface S9 and the tenth surface S10 may be aspherical. The aspheric coefficients of the 9th and 10th surfaces (S9 and S10) can be provided as S1 and S2 of L5 in FIG. 2. At least one or both of the ninth surface S9 and the tenth surface S10 may be provided without a critical point from the optical axis OA to the end of the effective area.

The sixth lens 106 may be placed sixth on the object side. The sixth lens 106 may be placed second on the sensor side. The sixth lens 106 may be disposed between the fifth lens 105 and the seventh lens 107. The sixth lens 106 may have positive (+) or negative (-) refractive power at the optical axis (OA). The sixth lens 106 may have positive (+) refractive power. The sixth lens 106 may include plastic or glass. For example, the sixth lens 106 may be made of plastic.

Based on the optical axis OA, the object-side 11th surface S11 of the sixth lens 106 may be convex and the sensor-side 12th surface S12 may be convex. The sixth lens 106 may have a convex shape on both sides. The sixth lens 106 is made of plastic and may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be aspherical. The aspheric coefficients of the 11th and 12th surfaces (S11 and S12) may be provided as S1 and S2 of L6 in FIG. 2.

The 11th surface S11 of the sixth lens 106 may be provided without a critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 of the sixth lens 106 may include a critical point from the optical axis OA to the end of the effective area. When the twelfth surface S12 has a critical point, it may be located in a range of 75% to 80% of the effective radius r62 at the optical axis OA, preferably in a range of 76% to 77%. The critical point of the twelfth surface S12 may be located in the range of 3.3 mm to 4 mm, preferably 3.5 mm to 3.6 mm, from the optical axis OA.

The seventh lens 107 may be placed furthest from the object. The seventh lens 107 may be placed closest to the image sensor 500. The seventh lens 107 may have positive (+) or negative (-) refractive power at the optical axis (OA). The seventh lens 107 may have negative (-) refractive power. The seventh lens 107 may include plastic or glass. For example, the seventh lens 107 may be made of plastic.

Based on the optical axis OA, the object-side 13th surface S13 of the seventh lens 107 may be concave and the sensor-side 14th surface S14 may be concave. The seventh lens 107 may have a concave shape on both sides. At least one or both of the 13th surface (S13) and the 14th surface (S14) may be aspherical. The aspheric coefficients of the 13th and 14th surfaces (S13 and S14) can be provided as S13 and S14 of L7 in FIG. 2.

The 13th surface S13 of the seventh lens 107 may include a critical point from the optical axis OA to the end of the effective area. When the 13th surface S13 has a critical point, it may be located in the range of 65% to 75% of the effective radius r71 at the optical axis OA, preferably in the range of 69% to 72%. The critical point of the 13th surface S13 may be located in the range of 3.5 mm to 4 mm, preferably 3.6 mm to 3.7 mm, from the optical axis OA. The 14th surface S14 of the seventh lens 107 may include a critical point from the optical axis OA to the end of the effective area. When the 14th surface S14 has a critical point, it may be located in a range of 65% to 75% of the effective radius r72 at the optical axis OA, preferably in a range of 69% to 72%. The critical point of the 14th surface S14 may be located in the range of 3.5 mm to 4 mm, preferably 3.6 mm to 3.7 mm, from the optical axis OA.

The seventh lens 107 may be a plastic lens closest to the image sensor 500. Additionally, by arranging two or more plastic lenses adjacent to the image sensor 500, aberrations such as spherical aberration and chromatic aberration can be improved by the lens surface having an aspherical surface, and the influence on resolution can be controlled. Additionally, by placing a plastic lens as a lens adjacent to the image sensor 500, it can be insensitive to assembly tolerances compared to a lens made of glass. In other words, being insensitive to assembly tolerances means that optical performance may not be significantly affected even if the assembly is assembled with a slight difference compared to the design. In addition, by providing the two lenses 106 and 107 adjacent to the image sensor 500 made of plastic, optical performance can be improved by the lens surface having an aspherical surface, for example, aberration characteristics can be improved and resolution can be prevented. .

Lens	Surface	Radius	Thickness	nd	vd	Semi Aperture	Focal length
One	S1	21.415	2.000	1.6413	55.1788	5.344	-51.1508
	S2	12.484	2.484			4.466
2	S3	-5.720	2.956	1.5371	55.7074	4.388	-26.5657
	S4	-11.270	0.300			4.270
STOP	-	-	0.300			4.200
3	S5	23.717	3.746	1.6223	63.8790	4.797	13.2530
	S6	-11.878	0.300			5.362
4	S7	9.867	4.764	1.5371	55.7074	5.897	15.2476
	S8	-40.034	0.300			5.726
5	S9	299.296	2.000	1.6640	21.2131	5.373	-10.7433
	S10	6.948	1.971			4.744
6	S11	34.503	3.157	1.5371	55.7074	4.830	9.0902
	S12	-5.505	0.300			4.892
7	S13	-1096.716	2.000	1.5371	55.7074	5.254	-11.4409
	S14	6.183	0.666			5.239
Filter		infinity	0.440
			1.936
Cover		infinity	0.330
			0.044
Image		infinity	0.000

Table 1 shows the surface number (Surface), radius of curvature (Radius), center thickness of each lens or distance between lens surfaces (Thickness), refractive index (Index, nd), and Abbe number of the lens according to the first embodiment of the present invention. (Abbe,vd), effective radius (Semi Aperture), and focal length (Fcoal length). At this time, the unit of curvature radius and thickness or distance may be mm.

item	value	item	value
F	10.8775	F-number	1.6400
ET1	2.3712	FOV_H	46.00
ET2	3.6833	E.P.D.	6.6326
ET3	2.0000	BFL	3.4160
ET4	2.3491	TD	26.5787
ET5	3.7244	ImgH	5.1450
ET6	2.1833	SD	18.8390
ET7	1.8859	TTL	29.9947
ΣIndex	11.0760	GLca_Aver	9.984
ΣAbbe	363.1005	PLca_Aver	10.123
ΣCT	20.6237	CT_max	4.7644
ΣCG	5.9550	CT_min	2.0000
CA_max	11.794	CT_Aver	2.9462
CA_min	8.400	F_LG1	-17.904
CA_Aver	9.971	F_LG2	8.578

Table 2 shows the items of the above-described equations in the optical system 1000 of the embodiment, including TTL (Total track length) (mm), BFL (Back focal length), and effective focal length (F) (mm) of the optical system 1000. ), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), TD (mm), which is the optical axis distance from the 1st surface (S1) to the 14th surface (S14), refractive index sum , Abbe number sum, thickness sum (mm), sum of spacing between adjacent lenses, effective diameter characteristics, sum of refractive index of glass lens, sum of refractive index of plastic material, angle of view (FOV_H) (Degree), edge thickness (ET), F number It's about etc.

The center thickness of the first to seventh lenses (101 to 107) is expressed as CT1 to CT7, the edge thickness at the end of the effective area of each lens is expressed as ET1 to ET7, and the center gap between two adjacent lenses is expressed as CT1 to CT7. They are indicated as CG1 to CG6, and the edge spacing between the edges of each lens is indicated as EG1 to EG6. Back focal length (BFL) is the optical axis distance from the image sensor 500 to the center of the last lens. TTL is the optical axis distance from the center of the first surface S1 of the first lens 101 to the upper surface of the image sensor 500.

As shown in FIG. 2, the lens surfaces of the first, second, fourth, fifth, sixth, and seventh lenses (101, 102, 104, 105, 106, and 107) among the lenses of the lens unit in the first embodiment may include an aspherical surface with a 30th order aspheric coefficient. For example, the first, second, fourth, fifth, sixth, and seventh lenses (101, 102, 104, 105, 106, and 107) may include lens surfaces having a 30th order aspherical coefficient. As described above, an aspheric surface with a 30th order aspherical coefficient (a value other than “0”) can particularly significantly change the aspheric shape of the peripheral area, thereby improving the optical performance of the peripheral area of the field of view (FOV).

The thickness (T1-T7) of the first to seventh lenses (101-107) and the gap (G1-G6) between two adjacent lenses can be set. As shown in Figure 3, in the Y-axis direction, the thickness of each lens (T1-T7) can be expressed at intervals of 0.1mm or 0.2mm or more, and the interval between each lens (G1-G6) can be expressed at intervals of 0.1mm or 0.2mm or more. It can be displayed every time.

Comparing the absolute value of the radius of curvature of each lens, the radius of curvature of the 13th surface (S13) of the 7th lens 107 at the optical axis OA is the largest among the lenses, and the radius of curvature of the 13th surface (S13) of the 7th lens 107 is the largest among the lenses, and the radius of curvature of the 13th surface (S13) of the 7th lens 107 is the largest among the lenses, and the radius of curvature of the 13th surface (S13) of the 7th lens 107 is the largest among the lenses, and the 12th surface of the 6th lens 106 The radius of curvature of (S12) may be the smallest among lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 50 times or more, for example, in the range of 50 to 60 times.

Among the object side and sensor side of the first to seventh lenses 101-107, there may be at least one or four lens surfaces with a radius of curvature greater than 40. Through this, the radius of curvature of the lens constituting the optical system 1000 can be designed to be mostly small to satisfy the angle of view, focal length, and overall distance of the lens placed in the vehicle.

Since the effective diameter of a plastic lens is smaller than that of a glass lens, the lens placed on the object side of the plastic lens may have a strong refractive power to provide refraction to the plastic lens. Additionally, in order to strengthen the refractive power, the radius of curvature of the lens surface may be small.

The absolute value of the radius of curvature of the first surface (S1) of the first lens 101 may be greater than the absolute value of the radius of curvature of the second surface (S2). The absolute value of the radius of curvature of the third surface (S3) of the second lens 102 may be smaller than the absolute value of the radius of curvature of the fourth surface (S4). The absolute value of the radius of curvature of the fifth surface (S5) of the third lens 103 may be greater than the absolute value of the radius of curvature of the sixth surface (S6). The absolute value of the radius of curvature of the seventh surface (S7) of the fourth lens 104 may be smaller than the absolute value of the radius of curvature of the eighth surface (S8). The absolute value of the radius of curvature of the ninth surface (S9) of the fifth lens 105 may be greater than the absolute value of the radius of curvature of the tenth surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the sixth lens 106 may be greater than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the seventh lens 107 may be greater than the absolute value of the radius of curvature of the 14th surface (S14).

The ratio of the radius of curvature of each lens may satisfy the following conditions.

Condition 1: 1.5 < L1R1/L1R| < 2

Condition 2: 0.5 < |L2R1/L2R2| < 1

Condition 3: 1.5 < |L3R1/L3R2| < 2

Condition 4: 0.1 < |L4R1/L4R2| < 0.5

Condition 5: 40 < |L5R1/L5R2| < 50

Condition 6: 5 < |L6R1/L6R2| < 10

Condition 7: 150 < |L7R1/L7R2| < 200

If you describe the central thickness (CT) of the lens based on the optical axis, the central thickness CT4 of the fourth lens 104 is the maximum of the lenses, and the first lens 101, the fifth lens 105 and the 7th and 7th. The central thickness (CT1, CT5, CT7) of at least one of the lenses 107 is the minimum among the lenses. The difference between the maximum and minimum center thickness of the lens may be in the range of 2 mm or more and 2.5 mm or less.

The center thickness of each lens may satisfy any one of the conditions below.

Condition 1: CT2, CT3, CT4, CT6 > CT1 = CT5 = CT7

Condition 2: CT3, CT4, CT6 > CT2 > CT1, CT3, CT5, CT7

Condition 3: CT4 > CT3 > CT1, CT2, CT5, CT6, CT7

Condition 4: CT4 > CT1, CT2, CT3, CT6, CT7

Condition 5: CT3, CT4 > CT6 > CT1, CT2, CT5, CT7

Describing the center spacing (CG) between the lenses, the center spacing (CG1) between the first lens 101 and the second lens 102 is the maximum, and the center spacing between the third and fourth lenses 103 and 104 ( At least one of CG3), the center distance CG4 between the fourth and fifth lenses 104 and 105, and the center distance CG6 between the sixth and seventh lenses 106 and 107 may be minimum. The difference between the maximum center spacing and the minimum center spacing among the spaced lens spacing may be 3 mm or more, for example, in the range of 3 mm to 4 mm.

The center spacing between each lens can satisfy the following conditions.

Condition 1: CG1 > CG2, CG3, CG4, CG5, CG6

Condition 2: CG1, CG5 > CG2 > CG3, CG4, CG6

Condition 3: CG1, CG2, CG5 > CG3 = CG4 = CG6

Condition 4: CG1 > CG5 > CG2, CG3, CG4, CG6

When explaining the effective diameter, a lens with the maximum effective diameter may be a glass lens. The lens with the maximum effective diameter may be the fourth lens 104. Here, the effective diameter is the average of the effective diameter of each lens on the object side and the effective diameter on the sensor side. The lens surface having the maximum effective diameter may be the seventh surface S7 of the fourth lens 104. The lens having the minimum effective diameter may be the second lens 102. The lens surface having the minimum effective diameter may be the fourth surface S4 of the second lens 102. The effective diameter of a plastic lens may be smaller than that of a glass lens. A lens made of plastic may be placed adjacent to the image sensor.

The effective diameter of each lens can satisfy any one of the conditions below.

Condition 1: CA_L3, CA_L4, CA_L5, CA_L7 > CA_L1 > CA_L2, CA_L6

Condition 2: CA_L1, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L2

Condition 3: CA_L4, CA_L7 > CA_L3 > CA_L1, CA_L2, CA_L5, CA_L6

Condition 4: CA_L4 > CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7

Condition 5: CA_L3, CA_L4, CA_L7 > CA_L5 > CA_L1, CA_L2, CA_L6

Condition 6: CA_L1, CA_L3, CA_L4, CA_L5, CA_L7 > CA_L6 > CA_L2

Condition 7: CA_L4 > CA_L7 > CA_L1, CA_L2, CA_L3, CA_L5, CA_L6

Explaining the refractive index, the refractive index of the fifth lens 105 is the highest among the lenses and may be greater than 1.6, for example, greater than 1.65. One or all of the second lens 102, fourth lens 104, sixth lens 106, and seventh lens 107 may have the lowest refractive index among the lenses. For example, the refractive index of the second lens 102, the sixth lens 106, and the seventh lens 108 may be the minimum among the lenses, and may be less than 1.6, for example, less than 1.55. The difference between the maximum and minimum refractive indices may be 0.2 or more. By providing a high refractive index lens made of glass closest to the object, and providing a low refractive index lens made of plastic for the lens adjacent to the glass lens and the lens adjacent to the image sensor 500, the incident efficiency is increased, and the lens adjacent to the glass material lens and the lens adjacent to the image sensor 500 are provided as low refractive index lenses made of plastic. It is possible to guide the image sensor 500 by adjusting the refractive power between the lens materials.

The refractive index of each lens may satisfy any one of the conditions below.

Condition 1: n5 > n1 > n2, n3, n4, n6, n7

Condition 2: n1, n3, n5 > n2 = n4 = n6 = n7

Condition 3: n1, n5 > n3 > n2, n4, n6, n7

Condition 4: n5 > n1, n2, n3, n4, n6, n7

Comparing the Abbe number, the Abbe number of the third lens 103 is the largest among the lenses and may be 60 or more. The Abbe number of the fifth lens 105 is the minimum among the lenses and may be 25 or less. The difference between the maximum refractive index and the minimum Abbe number may be 40 or more. By providing the largest Abbe number of the third lens 103 disposed in the center of the optical system 1000 and the smallest Abbe number of the fifth lens 105 with a low refractive index adjacent to the image sensor 500, The color dispersion of light traveling between glass and plastic lenses can be adjusted, and the color dispersion between the glass and plastic lenses can be increased to guide the light to the image sensor 500.

The Abbe number of each lens can satisfy any one of the conditions below.

Condition 1: v2, v3, v4, v6, v7 > v1 > v5

Condition 2: v3 > v2 = v4 = v6 = v7 > v1, v5

Condition 3: v3 > v1, v2, v4, v5, v6, v7

Condition 4: v1, v2, v3, v4, v6, v7 > v5

The focal lengths F1, F2, F5, and F7 of the first, second, fifth, and seventh lenses 101, 102, 105, and 107 may have a negative (-) sign. The first, second, fifth, and seventh lenses (101, 102, 105, and 107) may have negative refractive power. The focal lengths F3, F4, and F6 of the third, fourth, and sixth lenses 103, 104, and 106 may have a positive (+) sign. The third, fourth, and sixth lenses (103, 104, and 106) may have positive refractive power. A third lens 103 with positive (+) refractive power may be disposed on the sensor side of the first lens 101 and the second lens 102 with negative (-) refractive power. Through this, the light incident from the object side can move away from the optical axis direction and then converge again in the optical axis direction, forming a stable optical path.

Additionally, the fourth lens 104 and the fifth lens 105, which are adjacent lenses, can satisfy the following conditions.

Condition 1: Refractive index of a lens with positive refractive power < Refractive index of a lens with negative refractive power

Condition 2: Dispersion value of a lens with positive refractive power > Dispersion value of a lens with negative refractive power

Here, among the plastic lenses, the fourth lens 104 has positive refractive power and the fifth lens 105 has negative refractive power, so according to conditions 1 and 2, the refractive index of the fourth lens 104 is It is smaller than the refractive index of the fifth lens 105, and the dispersion value of the fourth lens 104 is greater than that of the fifth lens 105. Chromatic aberration occurring in plastic lenses can be corrected with plastic lenses. In addition, the fourth lens 104 and the fifth lens 105, which are plastic lenses arranged in succession, satisfy the refractive index difference of 0.1 to 0.15 and the Abbe number difference of 20 to 50, thereby reducing chromatic aberration occurring in the plastic lens. It can be compensated with

Optical systems produce chromatic aberration, and chromatic aberration is corrected using a bonded lens or two lenses placed in series. As the temperature changes from low to high, the lens repeats contraction and expansion. Since lenses made of the same material have the same amount of change in lens characteristics due to temperature changes, it is effective to correct chromatic aberration between lenses made of the same material even if the temperature changes. Therefore, in the first embodiment of the present invention, chromatic aberration occurring in the plastic lens can be corrected using the fourth lens 104 and the fifth lens 105.

From the optical axis to the effective diameter area, the maximum value of the distance between two lenses with the largest Abbe number difference among two adjacent lenses may be smaller than the maximum value of the distance between two other adjacent lenses. Here, the distance may mean the distance between two lenses, from the optical axis to the effective diameter area. Among the two lenses disposed adjacently, the two lenses with the largest difference in Abbe number may be the fourth lens 104 and the fifth lens 105. The distance between the sensor side (eighth surface (S8)) of the fourth lens 104 and the object side (ninth side (S9)) of the fifth lens 105 in the direction perpendicular to the optical axis from the optical axis to the effective diameter area. The maximum value may be less than the maximum value of the distance between two other adjacent lenses. Through this, the distance between two lenses made of plastic, which are difficult to bond, is designed to be small, and the Abbe number difference is maximized to have the effect of reducing the same chromatic aberration as a bonded lens even in a non-bonded state.

When comparing focal lengths in absolute values, the focal length of the first lens 101 is the largest among lenses and may be 50 or more to 60 or less. The focal length of the sixth lens 106 is the minimum among the lenses, and the absolute value of the focal length of the seventh lens 106 may be 5 or more and 10 or less.

The focal length of the first lens 101 is the largest among the lenses and the refractive power is the weakest, so the difference in Abbe numbers between the second lens 102 and the third lens 103 disposed on the sensor side of the first lens 101 is Although it is not large, it is effective in reducing chromatic aberration.

The absolute value of the focal length of each lens can satisfy any of the conditions below.

Condition 1: |f1| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|

Condition 2: |f1| > |f2| > |f3|, |f4|, |f5|, |f6|, |f7|

Condition 3: |f1|, |f2|, |f4| > |f3| > |f5|, |f6|, |f7|

Condition 4: |f1|, |f2| > |f4| > |f3|, |f5|, |f6|, |f7|

Condition 5: |f1|, |f2|, |f3|, |f4|, |f7| > |f5| > |f6|

Condition 6: |f1|, |f2|, |f3|, |f4|, |f5|, |f7| > |f6|

Condition 7: |f1|, |f2|, |f3|, |f4| > |f7| > |f5|, |f6|

The thickness (T1) of the first lens 101 may have a difference between the maximum thickness and the minimum thickness of 1.1 times or more, for example, 1.2 to 1.5 times, the center thickness (CT1) is the minimum, and the edge thickness (ET1) is the minimum. It can be maximum. The thickness T2 of the second lens 102 may have a maximum thickness ranging from 1 to 1.5 times the minimum thickness. The second lens 102 may have a minimum center thickness (CT2) and a maximum edge thickness (ET2). The thickness T3 of the third lens 103 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1 to 1.5 times the minimum thickness. The thickness T4 of the fourth lens 104 may be maximum at the center and minimum at the edge, with the maximum thickness ranging from 2 to 2.5 times the minimum thickness. The thickness T5 of the fifth lens 105 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1.2 to 1.7 times the minimum thickness. The thickness T6 of the sixth lens 106 may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 1.5 to 2 times the minimum thickness. The thickness T7 of the seventh lens 107 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1 to 1.5 times the minimum thickness.

The thickness of each lens can satisfy any of the conditions below.

Condition 1: 0.5 < CT1/ET1 < 1, 1 < ET1/CT1 < 1.5

Condition 2: 0.5 < CT2/ET2 < 1, 1 < ET2/CT2 < 1.5

Condition 3: 0.5 < CT3/ET3 < 1, 1 < ET3/CT3 < 1.5

Condition 4: 2 < CT4/ET4 < 2.5, 0.1 < ET4/CT4 < 0.5

Condition 5: 0.5 < CT5/ET5 < 1, 1.2 < ET5/CT5 < 1.7

Condition 6: 1.2 < CT6/ET6 < 1.7, 0.5 < ET6/CT6 < 1

Condition 7: 0.5 < CT7/ET7 < 1, 1 < ET7/CT7 < 1.5

Condition 8: 1 < ΣCT/ΣET < 1.2, 0.5 < ΣET/ΣCT < 1

Among the intervals G1-G7 between the lenses, the first interval G1 between the first and second lenses 101 and 102 may be maximum at the center and minimum at the edges. The second gap G2 between the second and third lenses 102 and 103 may be minimum at the center and maximum at the edges. The third gap G3 between the third and fourth lenses 103 and 104 may be maximum at the edge and minimum at the center. The fourth gap G4 between the fourth and fifth lenses 104 and 105 may be minimum at the center and maximum at the edges. The fifth gap G5 between the fifth and sixth lenses 105 and 106 may be maximum at the center and minimum at the edges. The sixth gap G6 between the sixth and seventh lenses 106 and 107 may be minimum at the center and maximum at the edges.

Figures 6, 8, and 10 are graphs showing the diffraction MTF (modulation transfer function) at room temperature, low temperature, and high temperature in the optical system of Figure 1, showing the luminance ratio (modulation) according to spatial frequency. This is the graph shown. 6, 8, and 10, in the first embodiment of the invention, the deviation of MTF from low or high temperature based on room temperature may be less than 10%, that is, 7% or less.

Figures 7, 9, and 11 are graphs showing aberration characteristics at room temperature, low temperature, and high temperature in the optical system of Figure 1. 7, 9, and 11 are graphs measuring spherical aberration, astigmatic field curves, and distortion from left to right. In FIGS. 7, 9, and 11, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in the wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion is a graph for light in the wavelength band of about 546 nm. . In the aberration diagrams of FIGS. 7, 9, and 11, it can be interpreted that the closer the curves at room temperature, low temperature, and high temperature are to the Y axis, the better the aberration correction function is. The optical system 1000 according to the first embodiment has You can see that in most areas, the measured values are adjacent to the Y axis. That is, the optical system 1000 according to the first embodiment has improved resolution and can have good optical performance not only in the center but also in the periphery of the field of view (FOV). Here, the low temperature is -20 degrees or lower, for example, in the range of -20 to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or 18 to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 to 105 degrees. It can be. Accordingly, it can be seen that the decrease in luminance ratio (modulation) from the low temperature to the high temperature in FIGS. 7, 9, and 11 is less than 10%, for example, 5% or less, or is almost unchanged.

Table 3 compares the changes in optical characteristics such as EFL, BFL, F number (F#), TTL, and angle of view (FOV_D) at room temperature, low temperature, and high temperature in the optical system according to the first embodiment, and the change in optical properties at low temperature based on room temperature. It can be seen that the change rate of optical properties is 5% or less, for example, 3% or less, and the change rate of optical properties at low temperatures based on room temperature is 5% or less, for example, 3% or less.

	room temperature	low temperature	High temperature	Low temperature/room temperature	High temperature/room temperature
EFL(F)	10.88	10.79	10.99	99.17%	101.01%
BFL	3.42	3.41	3.42	99.70%	100.00%
F#	1.64	1.63	1.66	99.39%	101.21%
TTL	29.99	29.92	30.08	99.76%	100.30%
FOV_D	54.69	55.19	54.10	100.91%	98.92%

Therefore, as shown in Table 3, the change in optical properties according to the temperature change from low to high temperature, for example, the rate of change in effective focal length (EFL), TTL, BFL, F number, and angle of view (FOV_D) is 10% or less, that is, It can be seen that it is in the range of 5% or less, for example, 0 to 5%. Even if at least one or two plastic lenses are used, temperature compensation for the plastic lenses is designed to prevent deterioration in the reliability of optical characteristics.

The optical system of the first embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the center but also in the periphery of the field of view (FOV).

The optical system according to the second embodiment of the invention will be described.

FIG. 13 is a side cross-sectional view of an optical system and a camera module having the same according to a second embodiment, FIG. 14 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 13, and FIG. 15 shows the thickness and thickness of each lens of the optical system of FIG. 13. This is a table showing the spacing between adjacent lenses, and Figure 16 is a table showing the Sag values of the lens surfaces of the first to seventh lenses in the optical system of Figure 13, and Figure 17 is a table showing the Sag values of the lens surfaces of the first to seventh lenses in the optical system of Figure 13. It is a table showing the Slope Angle of the surfaces, and Figure 18 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at low temperature of the optical system of Figure 13, and Figure 19 is a graph showing the aberration characteristics at low temperature of the optical system of Figure 13. It is a graph showing data, Figure 20 is a graph showing data on the diffraction MTF at room temperature of the optical system of Figure 13, Figure 21 is a graph showing data on aberration characteristics at room temperature of the optical system of Figure 13, and Figure 22 is a graph showing data on the diffraction MTF at high temperature of the optical system of FIG. 13, FIG. 23 is a graph showing data on aberration characteristics at high temperature of the optical system of FIG. 13, and FIG. 24 is the amount of ambient light of the optical system of FIG. 13. This is a graph showing rain.

Referring to FIG. 13, the optical system 1100 includes a lens unit, and the lens unit may include a first lens 201 to a seventh lens 207. The first to seventh lenses 201 to 207 may be sequentially arranged along the optical axis OA of the optical system 1100. Light corresponding to object information may pass through the first to seventh lenses 201 to 207 and the filter 600 and be incident on the image sensor 500.

The first lens 201 may be placed closest to the object. The first lens 201 may be placed furthest from the sensor side. The first lens 201 may have negative refractive power at the optical axis (OA). The first lens 201 may include a plastic material or a glass material, for example, a glass material. The first lens 201 made of glass can reduce changes in the center position and radius of curvature due to temperature changes in the surrounding environment, and protect the entrance side of the optical system 1100.

Based on the optical axis, the object-side first surface S1 of the first lens 201 may be convex, and the sensor-side second surface S2 may be concave. The first lens 201 may have a meniscus shape that is convex toward the object. The first lens 201 may have a meniscus shape that is concave toward the sensor. The first lens 201 is made of glass and may have an aspherical surface. At least one or both of the first surface (S1) and the second surface (S2) may be aspherical. The aspheric coefficients of the first and second surfaces S1 and S2 may be provided as S1 and S2 of L3 in FIG. 14. At least one or both of the first surface S1 and the second surface S2 may be provided without a critical point from the optical axis OA to the end of the effective area.

Due to the refractive characteristics of the first lens 201, the second lens 202 may be further spaced apart from the first lens 201. That is, the center spacing between the first and second lenses 201 and 202 may be the largest within the lens unit.

The refractive index (n1) of the first lens 201 may satisfy the condition of n1>1.6 or n1>1.62. When the refractive index (n1) of the first lens 201 satisfies the above conditions, the radius of curvature of the first and second lenses 201 and 202 can be increased, and lens manufacturing can be easy. If the refractive index (n1) of the first lens 201 is less than the condition, the lens surface must be sharply concave or convex to increase the refractive power of the first and second lenses 201 and 202. In this case, the lens manufacturing process is It is not easy, and the rate of lens defects increases and may cause a decrease in yield.

The second lens 202 may be disposed second on the object side. The second lens 202 may be placed sixth on the sensor side. The second lens 202 may be disposed between the first lens 201 and the third lens 203. The second lens 202 may have negative refractive power at the optical axis (OA). The second lens 202 may include plastic or glass. For example, the second lens 202 may be made of plastic.

Based on the optical axis OA, the object-side third surface S3 of the second lens 202 may be concave, and the sensor-side fourth surface S4 may be convex. The second lens 202 may have a meniscus shape that is convex toward the sensor. The second lens 202 may have a meniscus shape that is concave toward the object. The second lens 202 is made of plastic and may be aspherical. At least one or both of the third surface S3 and the fourth surface S4 may be aspherical. The aspheric coefficients of the third and fourth surfaces (S3 and S4) can be provided as S1 and S2 of L2 in FIG. 14. At least one or both of the third surface S3 and the fourth surface S4 may be provided without a critical point from the optical axis OA to the end of the effective area.

The aperture stop may be disposed around the fourth surface S4 on the sensor side of the second lens 202. The aperture (Stop) may be disposed around the object-side fifth surface S5 of the third lens 203. Aperture can reduce TTL within the range of view angle, and miniaturization of the optical system is possible. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and improve production efficiency. Additionally, the optical system can be miniaturized by reducing the TTL at a horizontal angle of view (FOV_H) of 40 to 50 degrees.

The third lens 203 may be arranged third from the object side. The third lens 203 may be placed fifth on the sensor side. The third lens 203 may be disposed between the second lens 202 and the fourth lens 204. The third lens 203 may have positive (+) refractive power at the optical axis (OA). The third lens 203 may include plastic or glass. For example, the third lens 203 may be made of glass.

Based on the optical axis, the object-side fifth surface S5 of the third lens 203 may be convex, and the sensor-side sixth surface S6 may be convex. The third lens 203 may have a convex shape on both sides. The third lens 203 is made of glass and may be spherical. At least one or both of the fifth surface S5 and the sixth surface S6 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fourth lens 204 may be placed fourth on the object side. The fourth lens 204 may be placed fourth on the sensor side. The fourth lens 204 may be disposed between the third lens 203 and the fifth lens 205. The fourth lens 204 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fourth lens 204 may have positive (+) refractive power. The fourth lens 204 may include plastic or glass. For example, the fourth lens 204 may be made of plastic.

Based on the optical axis, the object-side seventh surface S7 of the fourth lens 204 may be convex, and the sensor-side eighth surface S8 may be concave. The fourth lens 204 may have a meniscus shape that is convex toward the object. The fourth lens 204 may have a meniscus shape that is concave toward the sensor. The fourth lens 204 is made of plastic and may be aspherical. At least one or both of the seventh surface S7 and the eighth surface S8 may be aspherical. The aspherical coefficients of the seventh and eighth surfaces (S7 and S8) can be provided as S1 and S2 of L4 in FIG. 14. At least one or both of the seventh surface S7 and the eighth surface S8 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fifth lens 205 may be placed fifth on the object side. The fifth lens 205 may be placed third on the sensor side. The fifth lens 205 may be disposed between the fourth lens 204 and the sixth lens 206. The fifth lens 205 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fifth lens 205 may have negative refractive power. The fifth lens 205 may include plastic or glass. For example, the fifth lens 205 may be made of plastic.

Based on the optical axis OA, the object-side ninth surface S9 of the fifth lens 205 may be convex, and the sensor-side tenth surface S10 may be concave. The fifth lens 205 may have a meniscus shape that is convex toward the object. The fifth lens 205 may have a meniscus shape that is concave toward the sensor. The fifth lens 205 is made of plastic and may be aspherical. At least one or both of the ninth surface S9 and the tenth surface S10 may be aspherical. The aspheric coefficients of the 9th and 10th surfaces (S9 and S10) can be provided as S1 and S2 of L5 in FIG. 14. At least one or both of the ninth surface S9 and the tenth surface S10 may be provided without a critical point from the optical axis OA to the end of the effective area.

The sixth lens 206 may be placed sixth on the object side. The sixth lens 206 may be placed second on the sensor side. The sixth lens 206 may be disposed between the fifth lens 205 and the seventh lens 207. The sixth lens 206 may have positive (+) or negative (-) refractive power at the optical axis (OA). The sixth lens 206 may have positive (+) refractive power. The sixth lens 206 may include plastic or glass. For example, the sixth lens 206 may be made of plastic.

Based on the optical axis OA, the object-side 11th surface S11 of the sixth lens 206 may be convex, and the sensor-side 12th surface S12 may be convex. The sixth lens 206 may have a convex shape on both sides. The sixth lens 206 is made of plastic and may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be aspherical. The aspheric coefficients of the 11th and 12th surfaces (S11 and S12) can be provided as S1 and S2 of L6 in FIG. 14.

The 11th surface S11 of the sixth lens 106 may be provided without a critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 of the sixth lens 106 may include a critical point from the optical axis OA to the end of the effective area. When the twelfth surface S12 has a critical point, it may be located in the range of 85% to 90% of the effective radius r62 at the optical axis OA, preferably in the range of 86% to 89%. The critical point of the twelfth surface S12 may be located in the range of 3.5 mm to 4 mm, preferably 3.8 mm to 3.9 mm, from the optical axis OA.

The seventh lens 207 may be placed furthest from the object. The seventh lens 207 may be placed closest to the image sensor 500. The seventh lens 207 may have positive (+) or negative (-) refractive power at the optical axis (OA). The seventh lens 207 may have negative refractive power. The seventh lens 207 may include plastic or glass. For example, the seventh lens 207 may be made of plastic.

Based on the optical axis OA, the object-side 13th surface S13 of the seventh lens 207 may be convex, and the sensor-side 14th surface S14 may be concave. The seventh lens 207 may have a meniscus shape that is convex toward the object. The seventh lens 207 may have a meniscus shape that is concave toward the sensor. At least one or both of the 13th surface (S13) and the 14th surface (S14) may be aspherical. The aspheric coefficients of the 13th and 14th surfaces (S13 and S14) can be provided as S13 and S14 of L7 in FIG. 14.

The 13th surface S13 of the seventh lens 207 may include a critical point from the optical axis OA to the end of the effective area. When the 13th surface S13 has a critical point, it may be located in the range of 40% to 50% of the effective radius r71 at the optical axis OA, preferably in the range of 44% to 47%. The critical point of the 13th surface S13 may be located in the range of 1.8 mm to 2.2 mm, preferably 1.9 mm to 2 mm, from the optical axis OA. The 14th surface S14 of the seventh lens 207 may include a critical point from the optical axis OA to the end of the effective area. When the 14th surface S14 has a critical point, it may be located in the range of 50% to 60% of the effective radius r72 at the optical axis OA, preferably in the range of 54% to 56%. The critical point of the 14th surface S14 may be located in the range of 2.5 mm to 3 mm, preferably 2.7 mm to 2.8 mm, from the optical axis OA.

The seventh lens 207 may be a plastic lens closest to the image sensor 500. Additionally, by arranging two or more plastic lenses adjacent to the image sensor 500, aberrations such as spherical aberration and chromatic aberration can be improved by the lens surface having an aspherical surface, and the influence on resolution can be controlled. Additionally, by placing a plastic lens as a lens adjacent to the image sensor 500, it can be insensitive to assembly tolerances compared to a lens made of glass. In other words, being insensitive to assembly tolerances means that optical performance may not be significantly affected even if the assembly is assembled with a slight difference compared to the design. In addition, by providing two lenses 206 and 207 adjacent to the image sensor 500 made of plastic, optical performance can be improved by the lens surface having an aspherical surface, for example, aberration characteristics can be improved and resolution can be prevented. .

Lens	Surface	Radius	Thickness	nd	vd	Semi Aperture	Focal length
One	S1	95.704	2.000	1.6413	55.1788	5.583	-52.9632
	S2	24.865	2.211			4.713
2	S3	-6.903	3.846	1.5371	55.7074	4.634	-34.4158
	S4	-13.162	0.300			4.429
STOP	-	-	0.300			4.317
3	S5	20.497	3.776	1.6223	63.8790	4.975	13.4607
	S6	-13.164	0.387			5.451
4	S7	9.775	4.007	1.5371	55.7074	5.864	20.4567
	S8	75.895	0.300			5.498
5	S9	49.725	2.000	1.6640	21.2131	5.376	-10.9438
	S10	6.238	0.830			4.688
6	S11	12.027	3.362	1.5371	55.7074	4.696	17.6987
	S12	-40.922	1.306			4.457
7	S13	8.989	2.000	1.5371	55.7074	4.490	-53.3287
	S14	6.310	0.625			5.050
Filter		infinity	0.440
			1.936
Cover		infinity	0.330
			0.044
Image		infinity	0.000

Table 4 shows the surface number (Surface), radius of curvature (Radius), center thickness of each lens or distance between lens surfaces (Thickness), refractive index (Index, nd), and Abbe number of the lens according to the second embodiment of the present invention. (Abbe,vd), effective radius (Semi Aperture), and focal length (Fcoal length). At this time, the unit of curvature radius and thickness or distance may be mm.

item	value	item	value
F	10.8634	F-number	1.6400
ET1	2.4636	FOV_H	46.00
ET2	4.5362	E.P.D.	6.6241
ET3	2.0000	BFL	3.3752
ET4	2.0000	TD	26.6249
ET5	3.6250	ImgH	5.1450
ET6	2.0000	SD	18.2679
ET7	2.3358	TTL	30.0000
ΣIndex	11.0760	GLca_Aver	10.361
ΣAbbe	363.1005	PLca_Aver	9.836
ΣCT	20.9912	CT_max	4.0066
ΣCG	5.6336	CT_min	2.0000
CA_max	11.727	CT_Aver	2.9987
CA_min	8.634	F_LG1	-21.283
CA_Aver	9.896	F_LG2	8.866

Table 5 shows the items of the above-described equations in the optical system 1100 of the embodiment, including the total track length (mm), back focal length (BFL), and effective focal length (F) of the optical system 1100 (mm). ), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), TD (mm), which is the optical axis distance from the first surface (S1) to the twelfth surface (S12), refractive index sum , Abbe number sum, thickness sum (mm), sum of spacing between adjacent lenses, effective diameter characteristics, sum of refractive index of glass lens, sum of refractive index of plastic material, angle of view (FOV_H) (Degree), edge thickness (ET), F number It's about things like that.

The center thickness of the first to seventh lenses (201 to 207) is expressed as CT1 to CT7, the edge thickness at the end of the effective area of each lens is expressed as ET1 to ET7, and the center gap between two adjacent lenses is expressed as CT1 to CT7. They are indicated as CG1 to CG6, and the edge spacing between the edges of each lens is indicated as EG1 to EG6. Back focal length (BFL) is the optical axis distance from the image sensor 500 to the center of the last lens. TTL is the optical axis distance from the center of the first surface S1 of the first lens 201 to the upper surface of the image sensor 500.

As shown in FIG. 14, the lens surfaces of the first, second, fourth, fifth, sixth, and seventh lenses (201, 202, 204, 205, 206, and 207) among the lenses of the lens unit in the second embodiment may include an aspherical surface with a 30th order aspheric coefficient. For example, the first, second, fourth, fifth, sixth, and seventh lenses (201, 202, 204, 205, 206, and 207) may include lens surfaces having a 30th order aspherical coefficient. As described above, an aspheric surface with a 30th order aspherical coefficient (a value other than “0”) can particularly significantly change the aspheric shape of the peripheral area, thereby improving the optical performance of the peripheral area of the field of view (FOV).

The thickness (T1-T7) of the first to seventh lenses (201-207) and the gap (G1-G6) between two adjacent lenses can be set. As shown in Figure 3, in the Y-axis direction, the thickness of each lens (T1-T7) can be expressed at intervals of 0.1mm or 0.2mm or more, and the interval between each lens (G1-G6) can be expressed at intervals of 0.1mm or 0.2mm or more. It can be displayed every time.

Comparing the absolute value of the radius of curvature of each lens, the radius of curvature of the first surface S1 of the first lens 201 at the optical axis OA is the largest among the lenses, and the radius of curvature of the first surface S1 of the fifth lens 205 is the largest among the lenses, and the radius of curvature of the first surface S1 of the fifth lens 205 is the largest among the lenses. The radius of curvature of (S10) may be the smallest among lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 3 times or more, for example, in the range of 3 to 5 times.

Among the object side and sensor side of the first to seventh lenses 201-207, there may be at least one or four lens surfaces with a radius of curvature greater than 40. Through this, the radius of curvature of the lens constituting the optical system 1100 can be designed to be mostly small to satisfy the angle of view, focal length, and overall distance of the lens placed in the vehicle.

Since the effective diameter of a plastic lens is smaller than that of a glass lens, the lens placed on the object side of the plastic lens may have a strong refractive power to provide refraction to the plastic lens. Additionally, in order to strengthen the refractive power, the radius of curvature of the lens surface may be small.

The absolute value of the radius of curvature of the first surface (S1) of the first lens 201 may be greater than the absolute value of the radius of curvature of the second surface (S2). The absolute value of the radius of curvature of the third surface (S3) of the second lens 202 may be smaller than the absolute value of the radius of curvature of the fourth surface (S4). The absolute value of the radius of curvature of the fifth surface S5 of the third lens 203 may be greater than the absolute value of the radius of curvature of the sixth surface S6. The absolute value of the radius of curvature of the seventh surface (S7) of the fourth lens 204 may be smaller than the absolute value of the radius of curvature of the eighth surface (S8). The absolute value of the radius of curvature of the ninth surface (S9) of the fifth lens 205 may be greater than the absolute value of the radius of curvature of the tenth surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the sixth lens 206 may be smaller than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the seventh lens 207 may be greater than the absolute value of the radius of curvature of the 14th surface (S14).

The ratio of the radius of curvature of each lens may satisfy the following conditions.

Condition 1: 3 < L1R1/L1R| < 4

Condition 2: 0.5 < |L2R1/L2R2| < 1

Condition 3: 1.5 < |L3R1/L3R2| < 2

Condition 4: 0.1 < |L4R1/L4R2| < 0.5

Condition 5: 5 < |L5R1/L5R2| < 10

Condition 6: 0.1 < |L6R1/L6R2| < 0.5

Condition 7: 1 < |L7R1/L7R2| < 1.5

When explaining the central thickness (CT) of the lens based on the optical axis, the central thickness (CT4) of the fourth lens 204 is the largest among the lenses, and the central thickness (CT4) of the first lens 201, the fifth lens 205, and the seventh lens 204 are the largest among the lenses. The central thickness (CT1, CT5, CT7) of at least one of the lenses 207 is the minimum among the lenses. The difference between the maximum and minimum center thickness of the lens may be in the range of 2 mm or more and 2.5 mm or less.

The center thickness of each lens may satisfy any one of the conditions below.

Condition 1: CT2, CT3, CT4, CT6 > CT1 = CT5 = CT7

Condition 2: CT4 > CT2 > CT1, CT3, CT5, CT6, CT7

Condition 3: CT2, CT4 > CT3 > CT1, CT5, CT6, CT7

Condition 4: CT4 > CT1, CT2, CT3, CT6, CT7

Condition 5: CT2, CT3, CT4 > CT6 > CT1, CT5, CT7

Describing the center spacing (CG) between the lenses, the center spacing (CG1) between the first lens 201 and the second lens 202 is the maximum, and the center spacing between the fourth and fifth lenses 204 and 205 ( CG4) may be minimal. The difference between the maximum center spacing and the minimum center spacing among the spaced lens spacing may be 3 mm or more, for example, in the range of 3 mm to 4 mm.

The center spacing between each lens can satisfy the following conditions.

Condition 1: CG1 > CG2, CG3, CG4, CG5, CG6

Condition 2: CG1, CG5, CG6 > CG2 > CG3, CG4

Condition 3: CG1, CG2, CG5, CG6 > CG3 > CG4

Condition 4: CG1, CG2, CG3, CG5, CG6 > CG4

Condition 5: CG1, CG6 > CG5 > CG2, CG3, CG4

*Condition 6: CG1 > CG6 > CG2, CG3, CG4, CG5

When explaining the effective diameter, a lens with the maximum effective diameter may be a glass lens. The lens having the maximum effective diameter may be the fourth lens 204. Here, the effective diameter is the average of the effective diameter of each lens on the object side and the effective diameter on the sensor side. The lens surface having the maximum effective diameter may be the seventh surface S7 of the fourth lens 204. The lens having the minimum effective diameter may be the second lens 202. The lens surface having the minimum effective diameter may be the fourth surface S4 of the second lens 202. The effective diameter of a plastic lens may be smaller than that of a glass lens. A lens made of plastic may be placed adjacent to the image sensor.

The effective diameter of each lens can satisfy any one of the conditions below.

Condition 1: CA_L3, CA_L4 > CA_L1 > CA_L2, CA_L5, CA_L6, CA_L7

Condition 2: CA_L1, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L2

Condition 3: CA_L4 > CA_L3 > CA_L1, CA_L2, CA_L5, CA_L6, CA_L7

Condition 4: CA_L4 > CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7

Condition 5: CA_L1, CA_L3, CA_L4 > CA_L5 > CA_L2, CA_L6, CA_L7

Condition 6: CA_L1, CA_L3, CA_L4, CA_L5, CA_L7 > CA_L6 > CA_L2

Condition 7: CA_L1, CA_L3, CA_L4, CA_L5 > CA_L7 > CA_L2, CA_L6

Describing the refractive index, the refractive index of the fifth lens 205 is the highest among the lenses and may be greater than 1.6, for example, greater than 1.65. One or all of the second lens 202, fourth lens 204, sixth lens 206, and seventh lens 207 may have the lowest refractive index among the lenses. For example, the refractive index of the second lens 202, the sixth lens 206, and the seventh lens 108 may be the minimum among the lenses, and may be less than 1.6, for example, less than 1.55. The difference between the maximum and minimum refractive indices may be 0.2 or more. By providing a high refractive index lens made of glass closest to the object, and providing a low refractive index lens made of plastic for the lens adjacent to the glass lens and the lens adjacent to the image sensor 500, the incident efficiency is increased, and the lens adjacent to the glass material lens and the lens adjacent to the image sensor 500 are provided as low refractive index lenses made of plastic. It is possible to guide the image sensor 500 by adjusting the refractive power between the lens materials.

The refractive index of each lens may satisfy any one of the conditions below.

Condition 1: n5 > n1 > n2, n3, n4, n6, n7

Condition 2: n1, n3, n5 > n2 = n4 = n6 = n7

Condition 3: n1, n5 > n3 > n2, n4, n6, n7

Condition 4: n5 > n1, n2, n3, n4, n6, n7

Comparing the Abbe number, the Abbe number of the third lens 203 is the largest among the lenses and may be 60 or more. The Abbe number of the fifth lens 205 is the minimum among the lenses and may be 25 or less. The difference between the maximum refractive index and the minimum Abbe number may be 40 or more. By providing the largest Abbe number of the third lens 203 disposed in the center of the optical system 1100 and the smallest Abbe number of the fifth lens 205 with a low refractive index adjacent to the image sensor 500, The color dispersion of light traveling between glass and plastic lenses can be adjusted, and the color dispersion between the glass and plastic lenses can be increased to guide the light to the image sensor 500.

The Abbe number of each lens can satisfy any one of the conditions below.

Condition 1: v2, v3, v4, v6, v7 > v1 > v5

Condition 2: v3 > v2 = v4 = v6 = v7 > v1, v5

Condition 3: v3 > v1, v2, v4, v5, v6, v7

Condition 4: v1, v2, v3, v4, v6, v7 > v5

The focal lengths F1, F2, F5, and F7 of the first, second, fifth, and seventh lenses 201, 202, 205, and 207 may have a negative (-) sign. The first, second, fifth, and seventh lenses 201, 202, 205, and 207 may have negative refractive power. The focal lengths F3, F4, and F6 of the third, fourth, and sixth lenses 203, 204, and 206 may have a positive (+) sign. The third, fourth, and sixth lenses (203, 204, and 206) may have positive refractive power. A third lens 203 with positive (+) refractive power may be disposed on the sensor side of the first lens 201 and the second lens 202 with negative (-) refractive power. Through this, the light incident from the object side can move away from the optical axis direction and then converge again in the optical axis direction, forming a stable optical path.

Additionally, the fourth lens 204 and the fifth lens 205, which are adjacent lenses, can satisfy the following conditions.

Condition 1: Refractive index of a lens with positive refractive power < Refractive index of a lens with negative refractive power

Condition 2: Dispersion value of a lens with positive refractive power > Dispersion value of a lens with negative refractive power

Here, among the plastic lenses, the fourth lens 204 has positive refractive power and the fifth lens 205 has negative refractive power, so according to conditions 1 and 2, the refractive index of the fourth lens 204 is It is smaller than the refractive index of the fifth lens 205, and the dispersion value of the fourth lens 204 is greater than that of the fifth lens 205. Chromatic aberration occurring in plastic lenses can be corrected with plastic lenses. In addition, the fourth lens 204 and the fifth lens 205, which are plastic lenses arranged in succession, satisfy the refractive index difference of 0.1 to 0.15 and the Abbe number difference of 20 to 50, thereby reducing chromatic aberration occurring in the plastic lens. It can be compensated with

Optical systems produce chromatic aberration, and chromatic aberration is corrected using a bonded lens or two lenses placed in series. As the temperature changes from low to high, the lens repeats contraction and expansion. Since lenses made of the same material have the same amount of change in lens characteristics due to temperature changes, it is effective to correct chromatic aberration between lenses made of the same material even if the temperature changes. Therefore, in the second embodiment of the present invention, chromatic aberration occurring in the plastic lens can be corrected using the fourth lens 204 and the fifth lens 205.

From the optical axis to the effective diameter area, the maximum value of the distance between two lenses with the largest Abbe number difference among two adjacent lenses may be smaller than the maximum value of the distance between two other adjacent lenses. Here, the distance may mean the distance between two lenses, from the optical axis to the effective diameter area. Among the two lenses disposed adjacently, the two lenses with the largest difference in Abbe number may be the fourth lens 204 and the fifth lens 205. The distance between the sensor side (eighth surface (S8)) of the fourth lens 204 and the object side (ninth side (S9)) of the fifth lens 205 in the direction perpendicular to the optical axis from the optical axis to the effective diameter area. The maximum value may be less than the maximum value of the distance between two other adjacent lenses. Through this, the distance between two lenses made of plastic, which are difficult to bond, is designed to be small, and the difference in Abbe number is maximized to have the effect of reducing the same chromatic aberration as a bonded lens even in a non-bonded state.

Comparing the focal lengths in absolute values, the focal length of the seventh lens 207 is the largest among the lenses and may be 50 or more and 60 or less. The focal length of the fifth lens 205 is the minimum among the lenses, and the absolute value of the focal length of the seventh lens 205 may be 8 or more and 12 or less.

The absolute value of the focal length of each lens can satisfy any of the conditions below.

Condition 1: |f7| > |f1| > |f2|, |f3|, |f4|, |f5|, |f6|

Condition 2: |f1|, |f7| > |f2| > |f3|, |f4|, |f5|, |f6|

Condition 3: |f1|, |f2|, |f4|, |f6|, |f7| > |f3| > |f5|

Condition 4: |f1|, |f2|, |f7| > |f4| > |f3|, |f5|, |f6|

Condition 5: |f1|, |f2|, |f3|, |f4|, |f6|, |f7| > |f5|

Condition 6: |f1|, |f2|, |f4|, |f7| > |f6| > |f3|, |f5|

Condition 7: |f7| > |f1|, |f2|, |f3|, |f4|, |f5|, |f6|

The thickness (T1) of the first lens 201 may be 1.1 times or more, for example, 1.2 to 1.5 times the difference between the maximum and minimum thickness, the center thickness (CT1) is the minimum, and the edge thickness (ET1) is the minimum. It can be maximum. The thickness T2 of the second lens 202 may have a maximum thickness in the range of 1 to 1.5 times the minimum thickness. The second lens 202 may have a maximum center thickness (CT2) and a minimum edge thickness (ET2). The thickness T3 of the third lens 203 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1 to 1.5 times the minimum thickness. The thickness T4 of the fourth lens 204 may be maximum at the center and minimum at the edge, with the maximum thickness ranging from 2 to 2.5 times the minimum thickness. The thickness T5 of the fifth lens 205 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1.2 to 1.7 times the minimum thickness. The thickness T6 of the sixth lens 206 may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 1.5 to 2 times the minimum thickness. The thickness T7 of the seventh lens 207 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1 to 1.5 times the minimum thickness.

The thickness of each lens can satisfy any of the conditions below.

Condition 1: 0.5 < CT1/ET1 < 1, 1.5 < ET1/CT1 < 2

Condition 2: 1 < CT2/ET2 < 1.5, 0.5 < ET2/CT2 < 1

Condition 3: 0.5 < CT3/ET3 < 1, 1 < ET3/CT3 < 1.5

Condition 4: 2 < CT4/ET4 < 2.5, 0.1 < ET4/CT4 < 0.5

Condition 5: 0.5 < CT5/ET5 < 1, 1.2 < ET5/CT5 < 1.7

Condition 6: 1.2 < CT6/ET6 < 1.7, 0.5 < ET6/CT6 < 1

Condition 7: 0.5 < CT7/ET7 < 1, 1 < ET7/CT7 < 1.5

Condition 8: 1 < ΣCT/ΣET < 1.2, 0.5 < ΣET/ΣCT < 1

Among the intervals G1-G7 between the lenses, the first interval G1 between the first and second lenses 201 and 202 may be maximum at the center and minimum at the edges. The second gap G2 between the second and third lenses 202 and 203 may be minimum at the center and maximum at the edges. The third gap G3 between the third and fourth lenses 203 and 204 may be maximum at the edge and minimum at the center. The fourth gap G4 between the fourth and fifth lenses 204 and 205 may be minimum at the center and maximum at the edges. The fifth gap G5 between the fifth and sixth lenses 205 and 206 may be maximum at the center and minimum at the edges. The sixth gap G6 between the sixth and seventh lenses 206 and 207 may be minimum at the center and maximum at the edges.

Figures 18, 20, and 22 are graphs showing the diffraction MTF (modulation transfer function) at room temperature, low temperature, and high temperature in the optical system of Figure 13, showing the luminance ratio (modulation) according to spatial frequency. This is the graph shown. 18, 20, and 22, in the second embodiment of the invention, the deviation of MTF from low or high temperature based on room temperature may be less than 10%, that is, 7% or less.

Figures 19, 21, and 23 are graphs showing aberration characteristics at room temperature, low temperature, and high temperature in the optical system of Figure 13. 19, 21, and 23 are graphs measuring spherical aberration, astigmatic field curves, and distortion from left to right. In FIGS. 19, 21, and 23, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in the wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion is a graph for light in the wavelength band of about 546 nm. . In the aberration diagrams of FIGS. 19, 21, and 23, it can be interpreted that the closer the curves at room temperature, low temperature, and high temperature are to the Y axis, the better the aberration correction function is. The optical system 1100 according to the second embodiment has You can see that in most areas, the measured values are adjacent to the Y axis. That is, the optical system 1100 according to the second embodiment has improved resolution and can have good optical performance not only in the center but also in the periphery of the field of view (FOV). Here, the low temperature is -20 degrees or lower, for example, in the range of -20 to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or 18 to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 to 205 degrees. It can be. Accordingly, it can be seen that the decrease in luminance ratio (modulation) from the low temperature to the high temperature in FIGS. 19, 21, and 23 is less than 10%, for example, 5% or less, or is almost unchanged.

Table 6 compares the changes in optical properties such as EFL, BFL, F number (F#), TTL, and angle of view (FOV_D) at room temperature, low temperature, and high temperature in the optical system according to the first embodiment, and the change in optical properties at low temperature based on room temperature. It can be seen that the change rate of optical properties is 5% or less, for example, 3% or less, and the change rate of optical properties at low temperatures based on room temperature is 5% or less, for example, 3% or less.

	room temperature	low temperature	High temperature	Low temperature/room temperature	High temperature/room temperature
EFL(F)	10.86	10.78	10.95	99.26%	100.82%
BFL	3.38	3.37	3.38	99.70%	100.00%
F#	1.64	1.63	1.65	99.39%	100.60%
TTL	30.00	29.92	30.08	99.73%	100.26%
FOV_D	54.53	54.97	54.09	100.80%	99.19%

Therefore, as shown in Table 6, the change in optical properties according to the temperature change from low to high temperature, for example, the rate of change in effective focal length (EFL), TTL, BFL, F number, and angle of view (FOV_D) is 10% or less, that is, It can be seen that it is in the range of 5% or less, for example, 0 to 5%. Even if at least one or two plastic lenses are used, temperature compensation for the plastic lenses is designed to prevent deterioration in the reliability of optical characteristics.

The optical system of the first embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the center but also in the periphery of the field of view (FOV).

The optical system according to the third embodiment of the invention will be described.

FIG. 25 is a side cross-sectional view of an optical system and a camera module having the same according to a third embodiment, FIG. 26 is a table showing the aspheric coefficients of lenses in the optical system of FIG. 25, and FIG. 27 shows the thickness and thickness of each lens of the optical system of FIG. 25. This is a table showing the spacing between adjacent lenses, Figure 28 is a table showing the Sag values of the lens surfaces of the first to seventh lenses in the optical system of Figure 25, and Figure 29 is a table showing the lenses of the first to seventh lenses in the optical system of Figure 25. It is a table showing the Slope Angle of the planes, Figure 30 is a graph showing data on the diffraction MTF at room temperature of the optical system of Figure 25, and Figure 31 is a graph showing data on aberration characteristics at room temperature of the optical system of Figure 25. , FIG. 32 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at low temperature of the optical system of FIG. 25, FIG. 33 is a graph showing data on aberration characteristics at low temperature of the optical system of FIG. 25, and FIG. 34 is a graph showing data on the diffraction MTF at high temperature of the optical system of FIG. 25, FIG. 35 is a graph showing data on aberration characteristics at high temperature of the optical system of FIG. 25, and FIG. 36 is the amount of ambient light of the optical system of FIG. 25. This is a graph showing rain.

Referring to FIG. 25, the optical system 1200 includes a lens unit, and the lens unit may include a first lens 301 to a seventh lens 307. The first to seventh lenses 301 to 307 may be sequentially arranged along the optical axis OA of the optical system 1200. Light corresponding to object information may pass through the first to seventh lenses 301 to 307 and the filter 600 and enter the image sensor 500.

The first lens 301 may be placed closest to the object. The first lens 301 may be placed furthest from the sensor side. The first lens 301 may have negative (-) refractive power at the optical axis (OA). The first lens 301 may include a plastic material or a glass material, for example, a glass material. The first lens 301 made of glass can reduce changes in the center position and radius of curvature due to temperature changes in the surrounding environment, and protect the entrance side of the optical system 1200.

Based on the optical axis, the object-side first surface S1 of the first lens 301 may be convex, and the sensor-side second surface S2 may be concave. The first lens 301 may have a meniscus shape that is convex toward the object. The first lens 301 may have a meniscus shape that is concave toward the sensor. The first lens 301 is made of glass and may have an aspherical surface. At least one or both of the first surface (S1) and the second surface (S2) may be aspherical. The aspheric coefficients of the first and second surfaces S1 and S2 may be provided as S1 and S2 of L3 in FIG. 26. At least one or both of the first surface S1 and the second surface S2 may be provided without a critical point from the optical axis OA to the end of the effective area.

Due to the refractive characteristics of the first lens 301, the second lens 302 may be further spaced apart from the first lens 301. That is, the center spacing between the first and second lenses 301 and 302 may be the largest within the lens unit.

The refractive index (n1) of the first lens 301 may satisfy the condition of n1>1.6 or n1>1.62. When the refractive index (n1) of the first lens 301 satisfies the above conditions, the radius of curvature of the first and second lenses 301 and 302 can be increased, and lens manufacturing can be easy. If the refractive index (n1) of the first lens 301 is less than the condition, the lens surface must be sharply concave or convex to increase the refractive power of the first and second lenses 301 and 302, and in this case, lens manufacturing is required. It is not easy, and the rate of lens defects increases and may cause a decrease in yield.

The second lens 302 may be disposed second on the object side. The second lens 302 may be placed sixth on the sensor side. The second lens 302 may be disposed between the first lens 301 and the third lens 303. The second lens 302 may have negative refractive power at the optical axis (OA). The second lens 302 may include plastic or glass. For example, the second lens 302 may be made of plastic.

Based on the optical axis OA, the object-side third surface S3 of the second lens 302 may be concave, and the sensor-side fourth surface S4 may be convex. The second lens 302 may have a meniscus shape that is convex toward the sensor. The second lens 302 may have a meniscus shape that is concave toward the object. The second lens 302 is made of plastic and may be aspherical. At least one or both of the third surface S3 and the fourth surface S4 may be aspherical. The aspherical coefficients of the third and fourth surfaces S3 and S4 can be provided as S1 and S2 of L2 in FIG. 26. At least one or both of the third surface S3 and the fourth surface S4 may be provided without a critical point from the optical axis OA to the end of the effective area.

The aperture (Stop) may be disposed around the fourth surface (S4) on the sensor side of the second lens (302). The aperture (Stop) may be disposed around the object-side fifth surface S5 of the third lens 303. Aperture can reduce TTL within the range of view angle, and miniaturization of the optical system is possible. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and improve production efficiency. Additionally, the optical system can be miniaturized by reducing the TTL at a horizontal angle of view (FOV_H) of 40 to 50 degrees.

The third lens 303 may be arranged third from the object side. The third lens 303 may be placed fifth on the sensor side. The third lens 303 may be disposed between the second lens 302 and the fourth lens 304. The third lens 303 may have positive (+) refractive power at the optical axis (OA). The third lens 303 may include plastic or glass. For example, the third lens 303 may be made of glass.

Based on the optical axis, the object-side fifth surface S5 of the third lens 303 may be convex, and the sensor-side sixth surface S6 may be convex. The third lens 303 may have a convex shape on both sides. The third lens 303 is made of glass and may be spherical. At least one or both of the fifth surface S5 and the sixth surface S6 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fourth lens 304 may be placed fourth on the object side. The fourth lens 304 may be placed fourth on the sensor side. The fourth lens 304 may be disposed between the third lens 303 and the fifth lens 305. The fourth lens 304 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fourth lens 304 may have positive (+) refractive power. The fourth lens 304 may include plastic or glass. For example, the fourth lens 304 may be made of plastic.

Based on the optical axis, the object-side seventh surface S7 of the fourth lens 304 may be convex, and the sensor-side eighth surface S8 may be convex. The fourth lens 304 may have a convex shape on both sides. The fourth lens 304 is made of plastic and may be aspherical. At least one or both of the seventh surface S7 and the eighth surface S8 may be aspherical. The aspheric coefficients of the seventh and eighth surfaces (S7 and S8) can be provided as S1 and S2 of L4 in FIG. 26. At least one or both of the seventh surface S7 and the eighth surface S8 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fifth lens 305 may be placed fifth on the object side. The fifth lens 305 may be placed third on the sensor side. The fifth lens 305 may be disposed between the fourth lens 304 and the sixth lens 306. The fifth lens 305 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fifth lens 305 may have negative (-) refractive power. The fifth lens 305 may include plastic or glass. For example, the fifth lens 305 may be made of plastic.

Based on the optical axis OA, the object-side ninth surface S9 of the fifth lens 305 may be convex, and the sensor-side tenth surface S10 may be concave. The fifth lens 305 may have a meniscus shape that is convex toward the object. The fifth lens 305 may have a meniscus shape that is concave toward the sensor. The fifth lens 305 is made of plastic and may be aspherical. At least one or both of the ninth surface S9 and the tenth surface S10 may be aspherical. The aspheric coefficients of the 9th and 10th surfaces (S9 and S10) can be provided as S1 and S2 of L5 in FIG. 26. At least one or both of the ninth surface S9 and the tenth surface S10 may be provided without a critical point from the optical axis OA to the end of the effective area.

The sixth lens 306 may be placed sixth on the object side. The sixth lens 306 may be placed second on the sensor side. The sixth lens 306 may be disposed between the fifth lens 305 and the seventh lens 307. The sixth lens 306 may have positive (+) or negative (-) refractive power at the optical axis (OA). The sixth lens 306 may have positive (+) refractive power. The sixth lens 306 may include plastic or glass. For example, the sixth lens 306 may be made of plastic.

Based on the optical axis OA, the object-side 11th surface S11 of the sixth lens 306 may be convex and the sensor-side 12th surface S12 may be convex. The sixth lens 306 may have a convex shape on both sides. The sixth lens 306 is made of plastic and may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be aspherical. The aspheric coefficients of the 11th and 12th surfaces (S11 and S12) can be provided as S1 and S2 of L6 in FIG. 26.

The 11th surface S11 of the sixth lens 106 may be provided without a critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 of the sixth lens 106 may include a critical point from the optical axis OA to the end of the effective area. When the twelfth surface S12 has a critical point, it may be located in a range of 75% to 80% of the effective radius r62 at the optical axis OA, preferably in a range of 76% to 77%. The critical point of the twelfth surface S12 may be located in the range of 3.3 mm to 4 mm, preferably 3.5 mm to 3.6 mm, from the optical axis OA.

The seventh lens 307 may be placed furthest from the object. The seventh lens 307 may be placed closest to the image sensor 500. The seventh lens 307 may have positive (+) or negative (-) refractive power at the optical axis (OA). The seventh lens 307 may have negative (-) refractive power. The seventh lens 307 may include plastic or glass. For example, the seventh lens 307 may be made of plastic.

Based on the optical axis OA, the object-side 13th surface S13 of the seventh lens 307 may be convex, and the sensor-side 14th surface S14 may be concave. The seventh lens 307 may have a meniscus shape that is convex toward the object. The seventh lens 307 may have a meniscus shape that is concave toward the sensor. At least one or both of the 13th surface (S13) and the 14th surface (S14) may be aspherical. The aspheric coefficients of the 13th and 14th surfaces (S13 and S14) can be provided as S13 and S14 of L7 in FIG. 26.

The 13th surface S13 of the seventh lens 307 may be provided without a critical point from the optical axis OA to the end of the effective area. The 14th surface S14 of the seventh lens 307 may include a critical point from the optical axis OA to the end of the effective area. When the 14th surface S14 has a critical point, it may be located in a range of 65% to 75% of the effective radius r72 at the optical axis OA, preferably in a range of 69% to 72%. The critical point of the 14th surface S14 may be located in the range of 3.5 mm to 4 mm, preferably 3.7 mm to 3.8 mm, from the optical axis OA.

The seventh lens 307 may be a plastic lens closest to the image sensor 500. Additionally, by arranging two or more plastic lenses adjacent to the image sensor 500, aberrations such as spherical aberration and chromatic aberration can be improved by the lens surface having an aspherical surface, and the influence on resolution can be controlled. Additionally, by placing a plastic lens as a lens adjacent to the image sensor 500, it can be insensitive to assembly tolerances compared to a lens made of glass. In other words, being insensitive to assembly tolerances means that optical performance may not be significantly affected even if the assembly is assembled with a slight difference compared to the design. In addition, by providing two lenses 306 and 307 adjacent to the image sensor 500 made of plastic, optical performance can be improved by the lens surface having an aspherical surface, for example, aberration characteristics can be improved and resolution can be prevented. .

Lens	Surface	Radius	Thickness	nd	vd	Semi Aperture	Focal length
One	S1	19.593	2.000	1.6413	55.1788	5.545	-73.6385
	S2	13.295	2.542			4.619
2	S3	-5.916	3.104	1.5371	55.7074	4.530	-30.0942
	S4	-11.042	0.675			4.324
STOP	-	-	0.300			4.127
3	S5	25.126	3.560	1.6223	63.8790	4.668	13.8568
	S6	-12.415	0.490			5.206
4	S7	9.889	4.258	1.5371	55.7074	5.730	16.0695
	S8	-57.619	0.306			5.690
5	S9	312.301	2.000	1.6640	21.2131	5.396	-11.0568
	S10	7.154	1.940			4.773
6	S11	49.084	3.031	1.5371	55.7074	4.809	9.7407
	S12	-5.730	0.300			4.836
7	S13	32.400	2.000	1.5371	55.7074	5.133	-13.0293
	S14	5.631	0.745			5.161
Filter		infinity	0.440
			1.936
Cover		infinity	0.330
			0.044
Image		infinity	0.000

Table 7 shows the surface number (Surface), radius of curvature (Radius), center thickness of each lens or distance between lens surfaces (Thickness), refractive index (Index, nd), and Abbe number of the lens according to the third embodiment of the present invention. (Abbe,vd), effective radius (Semi Aperture), and focal length (Fcoal length). At this time, the unit of curvature radius and thickness or distance may be mm.

item	value	item	value
F	10.8841	F-number	1.6400
ET1	2.2492	FOV_H	46.00
ET2	3.8136	E.P.D.	6.6367
ET3	2.0000	BFL	3.4945
ET4	2.0760	TD	26.5055
ET5	3.5774	ImgH	5.1450
ET6	2.1499	SD	18.1848
ET7	1.9162	TTL	30.0000
ΣIndex	11.0760	GLca_Aver	10.018
ΣAbbe	363.1005	PLca_Aver	10.076
ΣCT	19.9524	CT_max	4.2575
ΣCG	6.5531	CT_min	2.0000
CA_max	11.460	CT_Aver	2.8503
CA_min	8.253	F_LG1	-22.077
CA_Aver	9.939	F_LG2	9.146

Table 8 shows the items of the above-described equations in the optical system 1200 of the third embodiment, including the total track length (mm), back focal length (BFL), and effective focal length (F) of the optical system 1200. (mm), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), TD (mm), which is the optical axis distance from the 1st side (S1) to the 12th side (S12), Sum of refractive indices, sum of Abbe numbers, sum of thickness (mm), sum of spacing between adjacent lenses, effective diameter characteristics, sum of refractive indices of glass lenses, sum of refractive indices of plastic materials, angle of view (FOV_H) (Degree), edge thickness (ET), This is about F numbers, etc.

The center thickness of the first to seventh lenses (301 to 307) is expressed as CT1 to CT7, the edge thickness at the end of the effective area of each lens is expressed as ET1 to ET7, and the center gap between two adjacent lenses is expressed as CT1 to CT7. They are indicated as CG1 to CG6, and the edge spacing between the edges of each lens is indicated as EG1 to EG6. Back focal length (BFL) is the optical axis distance from the image sensor 500 to the center of the last lens. TTL is the optical axis distance from the center of the first surface S1 of the first lens 301 to the upper surface of the image sensor 500.

As shown in FIG. 26, the lens surfaces of the first, second, fourth, fifth, sixth, and seventh lenses (301, 302, 304, 305, 306, and 307) among the lenses of the lens unit in the third embodiment may include an aspherical surface with a 30th order aspheric coefficient. For example, the first, second, fourth, fifth, sixth, and seventh lenses (301, 302, 304, 305, 306, and 307) may include lens surfaces having a 30th order aspherical coefficient. As described above, an aspheric surface with a 30th order aspherical coefficient (a value other than “0”) can particularly significantly change the aspheric shape of the peripheral area, thereby improving the optical performance of the peripheral area of the field of view (FOV).

The thickness (T1-T7) of the first to seventh lenses (301-307) and the gap (G1-G6) between two adjacent lenses can be set. As shown in Figure 3, in the Y-axis direction, the thickness of each lens (T1-T7) can be expressed at intervals of 0.1mm or 0.2mm or more, and the interval between each lens (G1-G6) can be expressed at intervals of 0.1mm or 0.2mm or more. It can be displayed every time.

Comparing the absolute value of the radius of curvature of each lens, the radius of curvature of the first surface S1 of the first lens 301 at the optical axis OA is the largest among the lenses, and the radius of curvature of the first surface S1 of the fifth lens 305 is the largest among the lenses, and the radius of curvature of the first surface S1 of the fifth lens 305 is the largest among the lenses. The radius of curvature of (S10) may be the smallest among lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 3 times or more, for example, in the range of 3 to 5 times.

Among the object side and sensor side of the first to seventh lenses 301-307, there may be at least one or four lens surfaces with a radius of curvature greater than 40. Through this, the radius of curvature of the lens constituting the optical system 1200 can be designed to be mostly small to satisfy the angle of view, focal length, and overall distance of the lens placed in the vehicle.

Since the effective diameter of a plastic lens is smaller than that of a glass lens, the lens placed on the object side of the plastic lens may have a strong refractive power to provide refraction to the plastic lens. Additionally, in order to strengthen the refractive power, the radius of curvature of the lens surface may be small.

The absolute value of the radius of curvature of the first surface (S1) of the first lens 301 may be greater than the absolute value of the radius of curvature of the second surface (S2). The absolute value of the radius of curvature of the third surface (S3) of the second lens 302 may be smaller than the absolute value of the radius of curvature of the fourth surface (S4). The absolute value of the radius of curvature of the fifth surface (S5) of the third lens 303 may be greater than the absolute value of the radius of curvature of the sixth surface (S6). The absolute value of the radius of curvature of the seventh surface (S7) of the fourth lens 304 may be smaller than the absolute value of the radius of curvature of the eighth surface (S8). The absolute value of the radius of curvature of the ninth surface (S9) of the fifth lens 305 may be greater than the absolute value of the radius of curvature of the tenth surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the sixth lens 306 may be greater than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the seventh lens 307 may be greater than the absolute value of the radius of curvature of the 14th surface (S14).

The ratio of the radius of curvature of each lens may satisfy the following conditions.

Condition 1: 1 < |L1R1/L1R| < 1.5

Condition 2: 0.5 < |L2R1/L2R2| < 1

Condition 3: 1.8 < |L3R1/L3R2| < 2.2

Condition 4: 0.1 < |L4R1/L4R2| < 0.5

Condition 5: 40 < |L5R1/L5R2| < 50

Condition 6: 5 < |L6R1/L6R2| < 10

Condition 7: 2 < |L7R1/L7R2| < 8

When explaining the central thickness (CT) of the lens based on the optical axis, the central thickness (CT4) of the fourth lens 304 is the largest among the lenses, and the central thickness (CT4) of the first lens 301, the fifth lens 305, and the seventh lens 304 are the largest among the lenses. The central thickness (CT1, CT5, CT7) of at least one of the lenses 307 is the minimum among the lenses. The difference between the maximum and minimum center thickness of the lens may be in the range of 2 mm or more and 2.5 mm or less.

The center thickness of each lens may satisfy any one of the conditions below.

Condition 1: CT2, CT3, CT4, CT6 > CT1 = CT5 = CT7

Condition 2: CT3, CT4 > CT2 > CT1, CT5, CT6, CT7

Condition 3: CT4 > CT3 > CT1, CT2, CT5, CT6, CT7

Condition 4: CT4 > CT1, CT2, CT3, CT6, CT7

Condition 5: CT2, CT3, CT4 > CT6 > CT1, CT5, CT7

Describing the center distance (CG) between the lenses, the center distance (CG1) between the first lens 301 and the second lens 302 is the maximum, and the center distance between the 6th and 7th lenses 306 and 307 ( CG6) may be minimal. The difference between the maximum center spacing and the minimum center spacing among the spaced lens spacing may be 3 mm or more, for example, in the range of 3 mm to 4 mm.

The center spacing between each lens can satisfy the following conditions.

Condition 1: CG1 > CG2, CG3, CG4, CG5, CG6

Condition 2: CG1, CG5 > CG2 > CG3, CG4, CG6

Condition 3: CG1, CG2, CG5 > CG3 > CG4, CG6

Condition 4: CG1, CG2, CG3, CG5 > CG4 > CG6

Condition 5: CG1 > CG5 > CG2, CG3, CG4, CG6

*Condition 6: CG1, CG2, CG3, CG4, CG5 > CG6

When explaining the effective diameter, a lens with the maximum effective diameter may be a glass lens. The lens having the maximum effective diameter may be the fourth lens 304. Here, the effective diameter is the average of the effective diameter of each lens on the object side and the effective diameter on the sensor side. The lens surface having the maximum effective diameter may be the seventh surface S7 of the fourth lens 304. The lens having the minimum effective diameter may be the second lens 302. The lens surface having the minimum effective diameter may be the fourth surface S4 of the second lens 302. The effective diameter of a plastic lens may be smaller than that of a glass lens. A lens made of plastic may be placed adjacent to the image sensor.

The effective diameter of each lens can satisfy any one of the conditions below.

Condition 1: CA_L4, CA_L5, CA_L7 > CA_L1 > CA_L2, CA_L3, CA_L6

Condition 2: CA_L1, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L2

Condition 3: CA_L1, CA_L4, CA_L5, CA_L7 > CA_L3 > CA_L2, CA_L6

Condition 4: CA_L4 > CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7

Condition 5: CA_L4, CA_L7 > CA_L5 > CA_L1, CA_L2, CA_L3, CA_L6

Condition 6: CA_L1, CA_L3, CA_L4, CA_L5, CA_L7 > CA_L6 > CA_L2

Condition 7: CA_L4 > CA_L7 > CA_L1, CA_L2, CA_L3, CA_L5, CA_L6

Describing the refractive index, the refractive index of the fifth lens 305 is the highest among the lenses and may be greater than 1.6, for example, greater than 1.65. One or all of the second lens 302, fourth lens 304, sixth lens 306, and seventh lens 307 may have the lowest refractive index among the lenses. For example, the refractive index of the second lens 302, the sixth lens 306, and the seventh lens 108 may be the minimum among the lenses, and may be less than 1.6, for example, less than 1.55. The difference between the maximum and minimum refractive indices may be 0.2 or more. By providing a high refractive index lens made of glass closest to the object, and providing a low refractive index lens made of plastic for the lens adjacent to the glass lens and the lens adjacent to the image sensor 500, the incident efficiency is increased, and the lens adjacent to the glass material lens and the lens adjacent to the image sensor 500 are provided as low refractive index lenses made of plastic. It is possible to guide the image sensor 500 by adjusting the refractive power between the lens materials.

The refractive index of each lens may satisfy any one of the conditions below.

Condition 1: n5 > n1 > n2, n3, n4, n6, n7

Condition 2: n1, n3, n5 > n2 = n4 = n6 = n7

Condition 3: n1, n5 > n3 > n2, n4, n6, n7

Condition 4: n5 > n1, n2, n3, n4, n6, n7

Comparing the Abbe number, the Abbe number of the third lens 303 is the largest among the lenses and may be 60 or more. The Abbe number of the fifth lens 305 is the minimum among the lenses and may be 25 or less. The difference between the maximum refractive index and the minimum Abbe number may be 40 or more. By providing the largest Abbe number of the third lens 303 disposed in the center of the optical system 1200 and the smallest Abbe number of the fifth lens 305 with a low refractive index adjacent to the image sensor 500, The color dispersion of light traveling between glass and plastic lenses can be adjusted, and the color dispersion between the glass and plastic lenses can be increased to guide the light to the image sensor 500.

The Abbe number of each lens can satisfy any one of the conditions below.

Condition 1: v2, v3, v4, v6, v7 > v1 > v5

Condition 2: v3 > v2 = v4 = v6 = v7 > v1, v5

Condition 3: v3 > v1, v2, v4, v5, v6, v7

Condition 4: v1, v2, v3, v4, v6, v7 > v5

The focal lengths F1, F2, F5, and F7 of the first, second, fifth, and seventh lenses 301, 302, 305, and 307 may have a negative (-) sign. The first, second, fifth, and seventh lenses (301, 302, 305, and 307) may have negative refractive power. The focal lengths F3, F4, and F6 of the third, fourth, and sixth lenses 303, 304, and 306 may have a positive (+) sign. The third, fourth, and sixth lenses (303, 304, and 306) may have positive (+) refractive power. A third lens 303 with positive (+) refractive power may be disposed on the sensor side of the first lens 301 and the second lens 302 with negative (-) refractive power. Through this, the light incident from the object side can move away from the optical axis direction and then converge again in the optical axis direction, forming a stable optical path.

Additionally, the fourth lens 304 and the fifth lens 305, which are adjacent lenses, can satisfy the following conditions.

Condition 1: Refractive index of a lens with positive refractive power < Refractive index of a lens with negative refractive power

Condition 2: Dispersion value of a lens with positive refractive power > Dispersion value of a lens with negative refractive power

Here, among the plastic lenses, the fourth lens 304 has positive refractive power and the fifth lens 305 has negative refractive power, so according to conditions 1 and 2, the refractive index of the fourth lens 304 is It is smaller than the refractive index of the fifth lens 305, and the dispersion value of the fourth lens 304 is greater than that of the fifth lens 305. Chromatic aberration occurring in plastic lenses can be corrected with plastic lenses. In addition, the fourth lens 304 and the fifth lens 305, which are plastic lenses arranged in succession, satisfy the refractive index difference of 0.1 to 0.15 and the Abbe number difference of 20 to 50, thereby reducing chromatic aberration occurring in the plastic lens. It can be compensated with

Optical systems produce chromatic aberration, and chromatic aberration is corrected using a bonded lens or two lenses placed in series. As the temperature changes from low to high, the lens repeats contraction and expansion. Since lenses made of the same material have the same amount of change in lens characteristics due to temperature changes, it is effective to correct chromatic aberration between lenses made of the same material even if the temperature changes. Therefore, in the third embodiment of the present invention, chromatic aberration occurring in the plastic lens can be corrected using the fourth lens 304 and the fifth lens 305.

From the optical axis to the effective diameter area, the maximum value of the distance between two lenses with the largest Abbe number difference among two adjacent lenses may be smaller than the maximum value of the distance between two other adjacent lenses. Here, the distance may mean the distance between two lenses, from the optical axis to the effective diameter area. Among the two lenses disposed adjacently, the two lenses with the largest difference in Abbe number may be the fourth lens 304 and the fifth lens 305. The distance between the sensor side (eighth surface (S8)) of the fourth lens 304 and the object side (ninth side (S9)) of the fifth lens 305 in the direction perpendicular to the optical axis from the optical axis to the effective diameter area. The maximum value may be less than the maximum value of the distance between two other adjacent lenses. Through this, the distance between two lenses made of plastic, which are difficult to bond, is designed to be small, and the Abbe number difference is maximized to have the effect of reducing the same chromatic aberration as a bonded lens even in a non-bonded state.

When comparing focal lengths in absolute values, the focal length of the first lens 301 is the largest among lenses and may be 70 or more to 80 or less. The focal length of the sixth lens 306 is the minimum among the lenses, and the absolute value of the focal length of the sixth lens 306 may be 8 or more and 12 or less.

The focal length of the first lens 301 is the largest among the lenses and the refractive power is the weakest, so the difference in Abbe number between the second lens 302 and the third lens 303 disposed on the sensor side of the first lens 301 is Although it is not large, it has the effect of reducing chromatic aberration.

The absolute value of the focal length of each lens can satisfy any of the conditions below.

Condition 1: |f1| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|

Condition 2: |f1| > |f2| > |f3|, |f4|, |f5|, |f6|, |f7|

Condition 3: |f1|, |f2|, |f4| > |f3| > |f5|, |f6|, |f7|

Condition 4: |f1|, |f2| > |f4| > |f3|, |f5|, |f6|, |f7|

Condition 5: |f1|, |f2|, |f3|, |f4|, |f7| > |f5| > |f6|

Condition 6: |f1|, |f2|, |f3|, |f4|, |f5|, |f7| > |f6|

Condition 7: |f1|, |f2|, |f3|, |f4| > |f7| > |f5|, |f6|

The thickness (T1) of the first lens 301 may be 1.5 times or more, for example, 1.5 to 2 times the difference between the maximum thickness and the minimum thickness, the center thickness (CT1) is the minimum, and the edge thickness (ET1) is the minimum. It can be maximum. The thickness T2 of the second lens 302 may have a maximum thickness in the range of 1 to 1.5 times the minimum thickness. The second lens 302 may have a minimum center thickness (CT2) and a maximum edge thickness (ET2). The thickness T3 of the third lens 303 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1 to 1.5 times the minimum thickness. The thickness T4 of the fourth lens 304 may be maximum at the center and minimum at the edge, with the maximum thickness ranging from 2 to 2.5 times the minimum thickness. The thickness T5 of the fifth lens 305 may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 1.2 to 1.7 times the minimum thickness. The thickness T6 of the sixth lens 306 may be maximum at the center and minimum at the edge, with the maximum thickness ranging from 1.2 to 1.7 times the minimum thickness. The thickness T7 of the seventh lens 307 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1 to 1.5 times the minimum thickness.

The thickness of each lens can satisfy any of the conditions below.

Condition 1: 0.5 < CT1/ET1 < 1, 1.5 < ET1/CT1 < 2

Condition 2: 0.5 < CT2/ET2 < 1, 1 < ET2/CT2 < 1.5

Condition 3: 0.5 < CT3/ET3 < 1, 1 < ET3/CT3 < 1.5

Condition 4: 2 < CT4/ET4 < 2.5, 0.1 < ET4/CT4 < 0.5

Condition 5: 0.5 < CT5/ET5 < 1, 1.2 < ET5/CT5 < 1.7

Condition 6: 1.2 < CT6/ET6 < 1.7, 0.5 < ET6/CT6 < 1

Condition 7: 0.5 < CT7/ET7 < 1, 1 < ET7/CT7 < 1.5

Condition 8: 1 < ΣCT/ΣET < 1.2, 0.5 < ΣET/ΣCT < 1

Among the intervals G1-G7 between the lenses, the first interval G1 between the first and second lenses 301 and 302 may be maximum at the center and minimum at the edges. The second gap G2 between the second and third lenses 302 and 303 may be minimum at the center and maximum at the edges. The third gap G3 between the third and fourth lenses 303 and 304 may be maximum at the edge and minimum at the center. The fourth gap G4 between the fourth and fifth lenses 304 and 305 may be minimum at the center and maximum at the edges. The fifth gap G5 between the fifth and sixth lenses 305 and 306 may be maximum at the center and minimum at the edges. The sixth gap G6 between the sixth and seventh lenses 306 and 307 may be minimum at the center and maximum at the edges.

Figures 30, 32, and 34 are graphs showing the diffraction MTF (modulation transfer function) at room temperature, low temperature, and high temperature in the optical system of Figure 25, showing the luminance ratio (modulation) according to spatial frequency. This is the graph shown. 30, 32, and 34, in the third embodiment of the invention, the deviation of MTF from low or high temperature based on room temperature may be less than 10%, that is, 7% or less.

Figures 31, 33, and 35 are graphs showing aberration characteristics at room temperature, low temperature, and high temperature in the optical system of Figure 25. 31, 33, and 35 are graphs measuring spherical aberration, astigmatic field curves, and distortion from left to right. In FIGS. 31, 33, and 35, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in the wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion is a graph for light in the wavelength band of about 546 nm. . In the aberration diagrams of FIGS. 31, 33, and 35, the closer the curves at room temperature, low temperature, and high temperature are to the Y axis, the better the aberration correction function is. The optical system 1200 according to the third embodiment has You can see that in most areas, the measured values are adjacent to the Y axis. That is, the optical system 1000 according to the third embodiment has improved resolution and can have good optical performance not only in the center but also in the periphery of the field of view (FOV). Here, the low temperature is -20 degrees or lower, for example, in the range of -20 to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or 18 to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 to 105 degrees. It can be. Accordingly, it can be seen that the decrease in luminance ratio (modulation) from the low temperature to the high temperature in FIGS. 31, 33, and 35 is less than 10%, for example, 5% or less, or is almost unchanged.

Table 9 compares the changes in optical characteristics such as EFL, BFL, F number (F#), TTL, and angle of view (FOV_H) at room temperature, low temperature, and high temperature in the optical system according to the third embodiment, and the changes in optical properties at low temperature based on room temperature. It can be seen that the change rate of optical properties is 5% or less, for example, 3% or less, and the change rate of optical properties at low temperatures based on room temperature is 5% or less, for example, 3% or less.

	room temperature	low temperature	High temperature	Low temperature/room temperature	High temperature/room temperature
EFL(F)	10.88	10.79	11.00	99.17%	101.10%
BFL	3.49	3.49	3.50	100.00%	100.28%
F#	1.64	1.63	1.66	99.39%	101.21%
TTL	30.00	29.93	30.09	99.76%	100.30%
FOV_D	54.34	54.81	53.79	100.86%	98.98%

Therefore, as shown in Table 9, the change in optical properties according to the temperature change from low to high temperature, for example, the rate of change in effective focal length (EFL), TTL, BFL, F number, and angle of view (FOV_D) is 10% or less, that is, It can be seen that it is in the range of 5% or less, for example, 0 to 5%. Even if at least one or two plastic lenses are used, temperature compensation for the plastic lenses is designed to prevent deterioration in the reliability of optical characteristics.

The optical system of the third embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the center but also in the periphery of the field of view (FOV).

The optical system according to the fourth embodiment of the invention will be described.

Figure 37 is a side cross-sectional view of the optical system and a camera module having the same according to the fourth embodiment, Figure 38 is a table showing the aspheric coefficients of the lenses in the optical system of Figure 37, and Figure 39 is the thickness and thickness of each lens of the optical system of Figure 37. This is a table showing the spacing between adjacent lenses, Figure 40 is a table showing the Sag values of the lens surfaces of the first to seventh lenses in the optical system of Figure 37, and Figure 41 is a table showing the lenses of the first to seventh lenses in the optical system of Figure 37. It is a table showing the Slope Angle of the planes, Figure 42 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at room temperature of the optical system of Figure 37, and Figure 43 is a graph showing the aberration characteristics at room temperature of the optical system of Figure 37. It is a graph showing data, Figure 44 is a graph showing data on the diffraction MTF at low temperature of the optical system of Figure 37, Figure 45 is a graph showing data on aberration characteristics at low temperature of the optical system of Figure 37, and Figure 46 is a graph showing data on the diffraction MTF at high temperature of the optical system of Figure 37, Figure 47 is a graph showing data on aberration characteristics at high temperature of the optical system of Figure 37, and Figure 48 is the amount of ambient light of the optical system of Figure 37. This is a graph showing rain.

Referring to FIG. 37, the optical system 1300 includes a lens unit, and the lens unit may include a first lens 401 to a seventh lens 407. The first to seventh lenses 401 to 407 may be sequentially arranged along the optical axis OA of the optical system 1300. Light corresponding to object information may pass through the first to seventh lenses 401 to 407 and the filter 600 and enter the image sensor 500.

The first lens 401 may be placed closest to the object. The first lens 401 may be placed furthest from the sensor side. The first lens 401 may have negative (-) refractive power at the optical axis (OA). The first lens 401 may include a plastic material or a glass material, for example, a glass material. The first lens 401 made of glass can reduce changes in the center position and radius of curvature due to temperature changes in the surrounding environment, and protect the entrance side of the optical system 1300.

Based on the optical axis, the object-side first surface S1 of the first lens 401 may be convex, and the sensor-side second surface S2 may be concave. The first lens 401 may have a meniscus shape that is convex toward the object. The first lens 401 may have a meniscus shape that is concave toward the sensor. The first lens 401 is made of glass and may have an aspherical surface. At least one or both of the first surface (S1) and the second surface (S2) may be aspherical. The aspherical coefficients of the first and second surfaces S1 and S2 can be provided as S1 and S2 of L3 in FIG. 38. At least one or both of the first surface S1 and the second surface S2 may be provided without a critical point from the optical axis OA to the end of the effective area.

Due to the refractive characteristics of the first lens 401, the second lens 402 may be further spaced apart from the first lens 401. That is, the center spacing between the first and second lenses 401 and 402 may be the largest within the lens unit.

The refractive index (n1) of the first lens 401 may satisfy the condition of n1>1.6 or n1>1.62. When the refractive index (n1) of the first lens 401 satisfies the above conditions, the radius of curvature of the first and second lenses 401 and 402 can be increased, and lens manufacturing can be easy. If the refractive index (n1) of the first lens 401 is less than the condition, the lens surface must be sharply concave or convex to increase the refractive power of the first and second lenses 401 and 402. In this case, the lens surface must be formed to be sharply concave or convex. It is not easy, and the rate of lens defects increases and may cause a decrease in yield.

The second lens 402 may be disposed second on the object side. The second lens 402 may be placed sixth on the sensor side. The second lens 402 may be disposed between the first lens 401 and the third lens 403. The second lens 402 may have negative refractive power at the optical axis (OA). The second lens 402 may include plastic or glass. For example, the second lens 402 may be made of plastic.

Based on the optical axis OA, the object-side third surface S3 of the second lens 402 may be concave, and the sensor-side fourth surface S4 may be convex. The second lens 402 may have a meniscus shape that is convex toward the sensor. The second lens 402 may have a meniscus shape that is concave toward the object. The second lens 402 is made of plastic and may be aspherical. At least one or both of the third surface S3 and the fourth surface S4 may be aspherical. The aspheric coefficients of the third and fourth surfaces (S3 and S4) can be provided as S1 and S2 of L2 in FIG. 38. At least one or both of the third surface S3 and the fourth surface S4 may be provided without a critical point from the optical axis OA to the end of the effective area.

The aperture stop may be disposed around the fourth surface S4 on the sensor side of the second lens 402. The aperture (Stop) may be disposed around the object-side fifth surface S5 of the third lens 403. Aperture can reduce TTL within the range of view angle, and miniaturization of the optical system is possible. Accordingly, it is possible to prevent a decrease in the yield by weight of the optical system and improve production efficiency. Additionally, the optical system can be miniaturized by reducing the TTL at a horizontal angle of view (FOV_H) of 40 to 50 degrees.

The third lens 403 may be arranged third from the object side. The third lens 403 may be placed fifth on the sensor side. The third lens 403 may be disposed between the second lens 402 and the fourth lens 404. The third lens 403 may have positive (+) refractive power at the optical axis (OA). The third lens 403 may include plastic or glass. For example, the third lens 403 may be made of glass.

Based on the optical axis, the object-side fifth surface S5 of the third lens 403 may be convex, and the sensor-side sixth surface S6 may be convex. The third lens 403 may have a convex shape on both sides. The third lens 403 is made of glass and may be spherical. At least one or both of the fifth surface S5 and the sixth surface S6 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fourth lens 404 may be placed fourth on the object side. The fourth lens 404 may be placed fourth on the sensor side. The fourth lens 404 may be disposed between the third lens 403 and the fifth lens 405. The fourth lens 404 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fourth lens 404 may have positive (+) refractive power. The fourth lens 404 may include plastic or glass. For example, the fourth lens 404 may be made of plastic.

Based on the optical axis, the object-side seventh surface S7 of the fourth lens 404 may be convex, and the sensor-side eighth surface S8 may be convex. The fourth lens 404 may have a convex shape on both sides. The fourth lens 404 is made of plastic and may be aspherical. At least one or both of the seventh surface (S7) and the eighth surface (S8) may be aspherical. The aspherical coefficients of the seventh and eighth surfaces (S7 and S8) can be provided as S1 and S2 of L4 in FIG. 38. At least one or both of the seventh surface S7 and the eighth surface S8 may be provided without a critical point from the optical axis OA to the end of the effective area.

The fifth lens 405 may be placed fifth on the object side. The fifth lens 405 may be placed third on the sensor side. The fifth lens 405 may be disposed between the fourth lens 404 and the sixth lens 406. The fifth lens 405 may have positive (+) or negative (-) refractive power at the optical axis (OA). The fifth lens 405 may have negative (-) refractive power. The fifth lens 405 may include plastic or glass. For example, the fifth lens 405 may be made of plastic.

Based on the optical axis OA, the object-side ninth surface S9 of the fifth lens 405 may be convex, and the sensor-side tenth surface S10 may be concave. The fifth lens 405 may have a meniscus shape that is convex toward the object. The fifth lens 405 may have a meniscus shape that is concave toward the sensor. The fifth lens 405 is made of plastic and may be aspherical. At least one or both of the ninth surface S9 and the tenth surface S10 may be aspherical. The aspherical coefficients of the 9th and 10th surfaces (S9, S10) can be provided as S1 and S2 of L5 in FIG. 38. At least one or both of the ninth surface S9 and the tenth surface S10 may be provided without a critical point from the optical axis OA to the end of the effective area.

The sixth lens 406 may be placed sixth on the object side. The sixth lens 406 may be placed second on the sensor side. The sixth lens 406 may be disposed between the fifth lens 405 and the seventh lens 407. The sixth lens 406 may have positive (+) or negative (-) refractive power at the optical axis (OA). The sixth lens 406 may have positive (+) refractive power. The sixth lens 406 may include plastic or glass. For example, the sixth lens 406 may be made of plastic.

Based on the optical axis OA, the object-side 11th surface S11 of the sixth lens 406 may be convex and the sensor-side 12th surface S12 may be convex. The sixth lens 406 may have a convex shape on both sides. The sixth lens 406 is made of plastic and may be aspherical. At least one or both of the 11th surface (S11) and the 12th surface (S12) may be aspherical. The aspheric coefficients of the 11th and 12th surfaces (S11 and S12) can be provided as S1 and S2 of L6 in FIG. 38.

The 11th surface S11 of the sixth lens 406 may be provided without a critical point from the optical axis OA to the end of the effective area. The twelfth surface S12 of the sixth lens 406 may include a critical point from the optical axis OA to the end of the effective area. When the twelfth surface S12 has a critical point, it may be located in a range of 65% to 75% of the effective radius r62 at the optical axis OA, preferably in a range of 70% to 73%. The critical point of the twelfth surface S12 may be located in the range of 3 mm to 3.5 mm, preferably 3.3 mm to 3.4 mm, from the optical axis OA.

The seventh lens 407 may be placed furthest from the object. The seventh lens 407 may be placed closest to the image sensor 500. The seventh lens 407 may have positive (+) or negative (-) refractive power at the optical axis (OA). The seventh lens 407 may have negative refractive power. The seventh lens 407 may include plastic or glass. For example, the seventh lens 407 may be made of plastic.

Based on the optical axis OA, the object-side 13th surface S13 of the seventh lens 407 may be convex, and the sensor-side 14th surface S14 may be concave. The seventh lens 407 may have a meniscus shape that is convex toward the object. The seventh lens 407 may have a meniscus shape that is concave toward the sensor. At least one or both of the 13th surface (S13) and the 14th surface (S14) may be aspherical. The aspheric coefficients of the 13th and 14th surfaces (S13 and S14) can be provided as S13 and S14 of L7 in FIG. 38.

The 13th surface S13 of the seventh lens 407 may be provided without a critical point from the optical axis OA to the end of the effective area. The 14th surface S14 of the seventh lens 407 may include a critical point from the optical axis OA to the end of the effective area. When the 14th surface S14 has a critical point, it may be located in the range of 60% to 70% of the effective radius r72 at the optical axis OA, preferably in the range of 63% to 66%. The critical point of the 14th surface S14 may be located in the range of 3 mm to 3.5 mm, preferably 3.3 mm to 3.4 mm, from the optical axis OA.

The seventh lens 407 may be a plastic lens closest to the image sensor 500. Additionally, by arranging two or more plastic lenses adjacent to the image sensor 500, aberrations such as spherical aberration and chromatic aberration can be improved by the lens surface having an aspherical surface, and the influence on resolution can be controlled. Additionally, by placing a plastic lens as a lens adjacent to the image sensor 500, it can be insensitive to assembly tolerances compared to a lens made of glass. In other words, being insensitive to assembly tolerances means that optical performance may not be significantly affected even if the assembly is assembled with a slight difference compared to the design. In addition, by providing two lenses 406 and 407 adjacent to the image sensor 500 made of plastic, optical performance can be improved by the lens surface having an aspherical surface, for example, aberration characteristics can be improved and resolution can be prevented. .

Lens	Surface	Radius	Thickness	nd	vd	Semi Aperture	Focal length
One	S1	14.136	2.000	1.8297	24.0394	5.586	-111.2740
	S2	11.472	3.003			4.552
2	S3	-5.742	3.861	1.5371	55.7074	4.412	-36.8873
	S4	-9.984	0.300			4.316
STOP	-	-	0.300			4.118
3	S5	44.737	3.066	1.6998	55.4589	4.434	16.2897
	S6	-14.866	0.300			4.970
4	S7	9.173	4.135	1.5371	55.7074	5.572	15.0073
	S8	-55.980	0.312			5.528
5	S9	103.533	2.000	1.6679	20.3792	5.260	-11.4574
	S10	7.071	1.911			4.746
6	S11	61.238	3.107	1.5371	55.7074	4.804	12.1193
	S12	-7.154	0.300			4.765
7	S13	18.713	2.000	1.5371	55.7074	5.244	-18.7281
	S14	6.298	0.654			5.296
Filter		infinity	0.440
			1.936
Cover		infinity	0.330
			0.044
Image		infinity	0.000

Table 10 shows the surface number (Surface), radius of curvature (Radius), center thickness of each lens or distance between lens surfaces (Thickness), refractive index (Index, nd), and Abbe number of the lens according to the fourth embodiment of the present invention. (Abbe,vd), effective radius (Semi Aperture), and focal length (Fcoal length). At this time, the unit of curvature radius and thickness or distance may be mm.

item	value	item	value
F	10.8811	F-number	1.6400
ET1	1.8827	FOV_H	46.00
ET2	4.5313	E.P.D.	6.6348
ET3	2.0000	BFL	3.4043
ET4	2.0000	TD	26.5957
ET5	3.4695	ImgH	5.1450
ET6	2.4636	SD	17.4316
ET7	1.4949	TTL	29.9947
ΣIndex	11.3458	GLca_Aver	9.771
ΣAbbe	322.7071	PLca_Aver	9.988
ΣCT	20.1687	CT_max	4.1347
ΣCG	6.4270	CT_min	2.0000
CA_max	11.172	CT_Aver	2.8812
CA_min	8.235	F_LG1	-29.521
CA_Aver	9.814	F_LG2	9.810

Table 11 shows the items of the above-described equations in the optical system 1300 of the embodiment, including the total track length (mm), back focal length (BFL), and effective focal length (F) of the optical system 1300 (mm). ), ImgH (mm), effective diameter (CA) (mm), thickness (mm), TTL (mm), TD (mm), which is the optical axis distance from the 1st surface (S1) to the 16th surface (S16), refractive index sum , Abbe number sum, thickness sum (mm), sum of spacing between adjacent lenses, effective diameter characteristics, sum of refractive index of glass lens, sum of refractive index of plastic material, angle of view (FOV_H) (Degree), edge thickness (ET), F number It's about things like that.

The center thickness of the first to seventh lenses (401 to 407) is expressed as CT1 to CT7, the edge thickness at the end of the effective area of each lens is expressed as ET1 to ET7, and the center gap between two adjacent lenses is expressed as CT1 to CT7. They are indicated as CG1 to CG6, and the edge spacing between the edges of each lens is indicated as EG1 to EG6. Back focal length (BFL) is the optical axis distance from the image sensor 500 to the center of the last lens. TTL is the optical axis distance from the center of the first surface S1 of the first lens 401 to the upper surface of the image sensor 500.

As shown in FIG. 38, the lens surfaces of the first, second, fourth, fifth, sixth, and seventh lenses (401, 402, 404, 405, 406, and 407) among the lenses of the lens unit in the fourth embodiment may include an aspherical surface with a 30th order aspherical coefficient. For example, the first, second, fourth, fifth, sixth, and seventh lenses (401, 402, 404, 405, 406, and 407) may include lens surfaces having a 30th order aspherical coefficient. As described above, an aspheric surface with a 30th order aspheric coefficient (a value other than “0”) can particularly significantly change the shape of the aspherical surface in the peripheral area, so the optical performance of the peripheral area of the field of view (FOV) can be well corrected.

The thickness (T1-T7) of the first to seventh lenses (401-407) and the gap (G1-G6) between two adjacent lenses can be set. As shown in Figure 3, in the Y-axis direction, the thickness of each lens (T1-T7) can be expressed at intervals of 0.1mm or 0.2mm or more, and the interval between each lens (G1-G6) can be expressed at intervals of 0.1mm or 0.2mm or more. It can be displayed every time.

Comparing the absolute value of the radius of curvature of each lens, the radius of curvature of the ninth surface S9 of the fifth lens 405 at the optical axis OA is the largest among the lenses, and the radius of curvature of the third surface S9 of the second lens 402 is the largest among the lenses. The radius of curvature of (S3) may be the smallest among lenses. The difference between the maximum radius of curvature and the minimum radius of curvature may be 15 times or more, for example, in the range of 15 to 25 times.

Among the object side and sensor side of the first to seventh lenses 401-407, there may be at least one or four lens surfaces with a radius of curvature greater than 40. Through this, the radius of curvature of the lens constituting the optical system 1300 can be designed to be mostly small to satisfy the angle of view, focal length, and overall distance of the lens placed in the vehicle.

Since the effective diameter of a plastic lens is smaller than that of a glass lens, the lens placed on the object side of the plastic lens may have a strong refractive power to provide refraction to the plastic lens. Additionally, in order to strengthen the refractive power, the radius of curvature of the lens surface may be small.

The absolute value of the radius of curvature of the first surface (S1) of the first lens 401 may be greater than the absolute value of the radius of curvature of the second surface (S2). The absolute value of the radius of curvature of the third surface (S3) of the second lens 402 may be smaller than the absolute value of the radius of curvature of the fourth surface (S4). The absolute value of the radius of curvature of the fifth surface (S5) of the third lens 403 may be greater than the absolute value of the radius of curvature of the sixth surface (S6). The absolute value of the radius of curvature of the seventh surface (S7) of the fourth lens 404 may be smaller than the absolute value of the radius of curvature of the eighth surface (S8). The absolute value of the radius of curvature of the ninth surface (S9) of the fifth lens 405 may be greater than the absolute value of the radius of curvature of the tenth surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the sixth lens 406 may be greater than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the seventh lens 407 may be greater than the absolute value of the radius of curvature of the 14th surface (S14).

The ratio of the radius of curvature of each lens may satisfy the following conditions.

Condition 1: 1 < |L1R1/L1R| < 1.5

Condition 2: 0.5 < |L2R1/L2R2| < 1

Condition 3: 2.5 < |L3R1/L3R2| < 3.5

Condition 4: 0.1 < |L4R1/L4R2| < 0.5

Condition 5: 10 < |L5R1/L5R2| < 20

Condition 6: 5 < |L6R1/L6R2| < 10

Condition 7: 1 < |L7R1/L7R2| < 5

When explaining the central thickness (CT) of the lens based on the optical axis, the central thickness (CT4) of the fourth lens 404 is the largest among the lenses, and the central thickness (CT4) of the first lens 401, the fifth lens 405, and the seventh lens 404 are the largest among the lenses. The central thickness (CT1, CT5, CT7) of at least one of the lenses 407 is the minimum among the lenses. The difference between the maximum and minimum center thickness of the lens may be in the range of 2 mm or more and 2.5 mm or less.

The center thickness of each lens may satisfy any one of the conditions below.

Condition 1: CT2, CT3, CT4, CT6 > CT1 = CT5 = CT7

Condition 2: CT4 > CT2 > CT1, CT3, CT5, CT6, CT7

Condition 3: CT2, CT4, CT6 > CT3 > CT1, CT5, CT7

Condition 4: CT4 > CT1, CT2, CT3, CT5, CT6, CT7

Condition 5: CT2, CT4 > CT6 > CT1, CT3, CT5, CT7

Describing the center spacing (CG) between the lenses, the center spacing (CG1) between the first lens 401 and the second lens 402 is the maximum, and the center spacing between the third and fourth lenses 403 and 404 ( At least one of CG3), and the center distance CG6 between the sixth and seventh lenses 406 and 407 may be minimum. The difference between the maximum center spacing and the minimum center spacing among the spaced lens spacing may be 3 mm or more, for example, in the range of 3 mm to 4 mm.

The center spacing between each lens can satisfy the following conditions.

Condition 1: CG1 > CG2, CG3, CG4, CG5, CG6

Condition 2: CG1, CG5 > CG2 > CG3, CG4, CG6

Condition 3: CG1, CG2, CG4, CG5 > CG3 = CG6

Condition 4: CG1, CG2, CG5 > CG4 > CG3, CG4, CG6

Condition 5: CG1 > CG5 > CG2, CG3, CG4, CG6

When explaining the effective diameter, a lens with the maximum effective diameter may be a glass lens. The lens with the maximum effective diameter may be the fourth lens 404. Here, the effective diameter is the average of the effective diameter of each lens on the object side and the effective diameter on the sensor side. The lens surface having the maximum effective diameter may be the seventh surface S7 of the fourth lens 404. The lens with the minimum effective diameter may be the second lens 402. The lens surface having the minimum effective diameter may be the fourth surface S4 of the second lens 402. The effective diameter of a plastic lens may be smaller than that of a glass lens. A lens made of plastic may be placed adjacent to the image sensor.

The effective diameter of each lens can satisfy any of the conditions below.

Condition 1: CA_L4, CA_L7 > CA_L1 > CA_L2, CA_L3, CA_L5, CA_L6

Condition 2: CA_L1, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L2

Condition 3: CA_L1, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L3 > CA_L2

Condition 4: CA_L4 > CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7

Condition 5: CA_L1, CA_L4, CA_L7 > CA_L5 > CA_L2, CA_L3, CA_L6

Condition 6: CA_L1, CA_L4, CA_L5, CA_L7 > CA_L6 > CA_L2, CA_L3

Condition 7: CA_L4 > CA_L7 > CA_L1, CA_L2, CA_L3, CA_L5, CA_L6

When explaining the refractive index, the refractive index of the first lens 401 is the highest among the lenses and may be greater than 1.8, for example, greater than 1.81. One or all of the second lens 402, fourth lens 404, sixth lens 406, and seventh lens 407 may have the lowest refractive index among the lenses. For example, the refractive index of the second lens 402, the sixth lens 406, and the seventh lens 108 may be the minimum among the lenses, and may be less than 1.6, for example, less than 1.55. The difference between the maximum and minimum refractive indices may be 0.2 or more. By providing a high refractive index lens made of glass closest to the object, and providing a low refractive index lens made of plastic for the lens adjacent to the glass lens and the lens adjacent to the image sensor 500, the incident efficiency is increased, and the lens adjacent to the glass material lens and the lens adjacent to the image sensor 500 are provided as low refractive index lenses made of plastic. It is possible to guide the image sensor 500 by adjusting the refractive power between the lens materials.

The refractive index of each lens may satisfy any one of the conditions below.

Condition 1: n1 > n2, n3, n4, n5, n6, n7

Condition 2: n1, n3, n5 > n2 = n4 = n6 = n7

Condition 3: n1 > n3 > n2, n4, n5, n6, n7

Condition 4: n1, n3 > n5 > n2, n4, n6, n7

When comparing Abbe numbers, the Abbe number of at least one of the second lens 402, fourth lens 404, sixth lens 406, and seventh lens 407 is the maximum among the lenses and may be 50 or more. . The Abbe number of the fifth lens 405 is the minimum among the lenses and may be 25 or less. The difference between the maximum refractive index and the minimum Abbe number may be 40 or more. By providing the largest Abbe number of the lens disposed in the center of the optical system 1000 and the smallest Abbe number of the fifth lens 405 with a low refractive index adjacent to the image sensor 500, glass and plastic materials It is possible to adjust the color dispersion of light traveling between the lenses and guide it to the image sensor 500 by increasing the color dispersion between the lenses made of glass and plastic.

The Abbe number of each lens can satisfy any one of the conditions below.

Condition 1: v2, v3, v4, v6, v7 > v1 > v5

Condition 2: v2 = v4 = v6 = v7 > v1, v3, v5

Condition 3: v2, v4, v6, v7 > v3 > v1, v5

Condition 4: v1, v2, v3, v4, v6, v7 > v5

The focal lengths F1, F2, F5, and F7 of the first, second, fifth, and seventh lenses 401, 402, 405, and 407 may have a negative (-) sign. The first, second, fifth, and seventh lenses (401, 402, 405, and 407) may have negative refractive power. The focal lengths F3, F4, and F6 of the third, fourth, and sixth lenses 403, 404, and 406 may have a positive (+) sign. The third, fourth, and sixth lenses (403, 404, and 406) may have positive (+) refractive power. A third lens 403 with positive (+) refractive power may be disposed on the sensor side of the first lens 401 and the second lens 402 with negative (-) refractive power. Through this, the light incident from the object side can move away from the optical axis direction and then converge again in the optical axis direction, forming a stable optical path.

Additionally, the fourth lens 404 and the fifth lens 405, which are adjacent lenses, can satisfy the following conditions.

Condition 1: Refractive index of a lens with positive refractive power < Refractive index of a lens with negative refractive power

Condition 2: Dispersion value of a lens with positive refractive power > Dispersion value of a lens with negative refractive power

Here, among the plastic lenses, the fourth lens 404 has positive refractive power and the fifth lens 405 has negative refractive power, so according to conditions 1 and 2, the refractive index of the fourth lens 404 is It is smaller than the refractive index of the fifth lens 405, and the dispersion value of the fourth lens 404 is greater than that of the fifth lens 405. Chromatic aberration occurring in plastic lenses can be corrected with plastic lenses. In addition, the fourth lens 404 and the fifth lens 405, which are plastic lenses arranged in succession, satisfy the refractive index difference of 0.1 to 0.15 and the Abbe number difference of 20 to 50, thereby reducing chromatic aberration occurring in the plastic lens. It can be compensated with

Optical systems produce chromatic aberration, and chromatic aberration is corrected using a bonded lens or two lenses placed in series. As the temperature changes from low to high, the lens repeats contraction and expansion. Since lenses made of the same material have the same amount of change in lens characteristics due to temperature changes, it is effective to correct chromatic aberration between lenses made of the same material even if the temperature changes. Therefore, in the fourth embodiment of the present invention, chromatic aberration occurring in the plastic lens can be corrected using the fourth lens 404 and the fifth lens 405.

From the optical axis to the effective diameter area, the maximum value of the distance between two lenses with the largest Abbe number difference among two adjacent lenses may be smaller than the maximum value of the distance between two other adjacent lenses. Here, the distance may mean the distance between two lenses, from the optical axis to the effective diameter area. Among the two lenses disposed adjacently, the two lenses with the largest difference in Abbe number may be the fourth lens 404 and the fifth lens 405. The distance between the sensor side (eighth surface (S8)) of the fourth lens 404 and the object side (ninth side (S9)) of the fifth lens 405 in the direction perpendicular to the optical axis from the optical axis to the effective diameter area. The maximum value may be less than the maximum value of the distance between two other adjacent lenses. Through this, the distance between two lenses made of plastic, which are difficult to bond, is designed to be small, and the Abbe number difference is maximized to have the effect of reducing the same chromatic aberration as a bonded lens even in a non-bonded state.

When comparing focal lengths in absolute values, the focal length of the first lens 401 is the largest among lenses and may be 100 or more and 120 or less. The focal length of the fifth lens 405 is the minimum among the lenses, and the absolute value of the focal length of the fifth lens 405 may be 10 or more and 12 or less.

The focal length of the first lens 401 is the largest among the lenses and the refractive power is the weakest, so the difference in Abbe number between the second lens 402 and the fourth lens 404 disposed on the sensor side of the first lens 401 is Although it is not large, it is effective in reducing chromatic aberration.

The absolute value of the focal length of each lens can satisfy any of the conditions below.

Condition 1: |f1| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|

Condition 2: |f1| > |f2| > |f3|, |f4|, |f5|, |f6|, |f7|

Condition 3: |f1|, |f2|, |f7| > |f3| > |f4|, |f5|, |f6|

Condition 4: |f1|, |f2|, |f3|, |f7| > |f4| > |f5|, |f6|

Condition 5: |f1|, |f2|, |f3|, |f4|, |f6|, |f7| > |f5|

Condition 6: |f1|, |f2|, |f3|, |f4|, |f7| > |f6| > |f5|

Condition 7: |f1|, |f2| > |f7| > |f3|, |f4|, |f5|, |f6|

The thickness T1 of the first lens 401 may be 1.5 to 2 times the difference between the maximum thickness and the minimum thickness, the center thickness CT1 may be the minimum, and the edge thickness ET1 may be the maximum. The thickness T2 of the second lens 402 may have a maximum thickness in the range of 1 to 1.5 times the minimum thickness. The second lens 402 may have a maximum center thickness (CT2) and a minimum edge thickness (ET2). The thickness T3 of the third lens 403 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1 to 1.5 times the minimum thickness. The thickness T4 of the fourth lens 404 may be maximum at the center and minimum at the edge, with the maximum thickness ranging from 2 to 2.5 times the minimum thickness. The thickness T5 of the fifth lens 405 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1.2 to 1.7 times the minimum thickness. The thickness T6 of the sixth lens 406 may be maximum at the center and minimum at the edge, with the maximum thickness ranging from 1.2 to 1.7 times the minimum thickness. The thickness T7 of the seventh lens 407 may be minimum at the center and maximum at the edge, with the maximum thickness ranging from 1.2 to 1.7 times the minimum thickness.

The thickness of each lens can satisfy any of the conditions below.

Condition 1: 0.5 < CT1/ET1 < 1, 1.5 < ET1/CT1 < 2

Condition 2: 1 < CT2/ET2 < 1.5, 0.5 < ET2/CT2 < 1

Condition 3: 0.5 < CT3/ET3 < 1, 1 < ET3/CT3 < 1.5

Condition 4: 2 < CT4/ET4 < 2.5, 0.1 < ET4/CT4 < 0.5

Condition 5: 0.5 < CT5/ET5 < 1, 1.2 < ET5/CT5 < 1.7

Condition 6: 1.2 < CT6/ET6 < 1.7, 0.5 < ET6/CT6 < 1

Condition 7: 0.5 < CT7/ET7 < 1, 1.2 < ET7/CT7 < 1.7

Condition 8: 1 < ΣCT/ΣET < 1.2, 0.5 < ΣET/ΣCT < 1

Among the intervals G1-G7 between the lenses, the first interval G1 between the first and second lenses 401 and 402 may be maximum at the center and minimum at the edges. The second gap G2 between the second and third lenses 402 and 403 may be minimum at the center and maximum at the edges. The third gap G3 between the third and fourth lenses 403 and 404 may be maximum at the edge and minimum at the center. The fourth gap G4 between the fourth and fifth lenses 404 and 405 may be minimum at the center and maximum at the edges. The fifth gap G5 between the fifth and sixth lenses 405 and 406 may be maximum at the center and minimum at the edges. The sixth gap G6 between the sixth and seventh lenses 406 and 407 may be minimum at the center and maximum at the edges.

Figures 42, 44, and 46 are graphs showing the diffraction MTF (modulation transfer function) at room temperature, low temperature, and high temperature in the optical system of Figure 37, showing the luminance ratio (modulation) according to spatial frequency. This is the graph shown. 42, 44, and 46, in the fourth embodiment of the invention, the deviation of MTF from low or high temperature based on room temperature may be less than 10%, that is, 7% or less.

Figures 43, 45, and 47 are graphs showing aberration characteristics at room temperature, low temperature, and high temperature in the optical system of Figure 37. 43, 45, and 47 are graphs measuring spherical aberration, astigmatic field curves, and distortion from left to right. In FIGS. 43, 45, and 47, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in the wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graph for astigmatism and distortion is a graph for light in the wavelength band of about 546 nm. . In the aberration diagrams of FIGS. 43, 45, and 47, it can be interpreted that the closer the curves at room temperature, low temperature, and high temperature are to the Y axis, the better the aberration correction function is. The optical system 1300 according to the fourth embodiment has You can see that in most areas, the measured values are adjacent to the Y axis. That is, the optical system 1300 according to the fourth embodiment has improved resolution and can have good optical performance not only in the center but also in the periphery of the field of view (FOV). Here, the low temperature is -20 degrees or lower, for example, in the range of -20 to -40 degrees, the room temperature is in the range of 22 degrees ± 5 degrees or 18 to 27 degrees, and the high temperature is 85 degrees or higher, for example, in the range of 85 to 405 degrees. It can be. Accordingly, it can be seen that the decrease in luminance ratio (modulation) from the low temperature to the high temperature in FIGS. 43, 45, and 47 is less than 10%, for example, 5% or less, or is almost unchanged.

Table 12 compares the changes in optical characteristics such as EFL, BFL, F number (F#), TTL, and angle of view (FOV_H) at room temperature, low temperature, and high temperature in the optical system according to the fourth embodiment, and the changes in optical properties at low temperature based on room temperature. It can be seen that the change rate of optical properties is 5% or less, for example, 3% or less, and the change rate of optical properties at low temperatures based on room temperature is 5% or less, for example, 3% or less.

	room temperature	low temperature	High temperature	Low temperature/room temperature	High temperature/room temperature
EFL(F)	10.88	10.81	10.97	99.35%	100.82%
BFL	3.40	3.40	3.41	100.00%	100.29%
F#	1.64	1.63	1.65	99.39%	100.60%
TTL	30.00	29.93	30.09	99.76%	100.30%
FOV_D	54.51	54.90	54.03	100.71%	99.11%

Therefore, as shown in Table 12, the change in optical properties according to the temperature change from low to high temperature, for example, the rate of change in effective focal length (EFL), TTL, BFL, F number, and angle of view (FOV_D) is 10% or less, that is, It can be seen that it is in the range of 5% or less, for example, 0 to 5%. Even if at least one or two plastic lenses are used, temperature compensation for the plastic lenses is designed to prevent deterioration in the reliability of optical characteristics.

The optical system of the fourth embodiment disclosed above can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only in the center but also in the periphery of the field of view (FOV).

The optical systems 1000, 1100, 1200, and 1300 according to the first to fourth embodiments disclosed above may satisfy at least one or two of the equations described below. Accordingly, the optical systems 1000, 1100, 1200, and 1300 according to the first to fourth embodiments may have improved optical characteristics. For example, when the optical system (1000, 1100, 1200, 1300) satisfies at least one mathematical equation, the optical system (1000, 1100, 1200, 1300) can effectively control aberration characteristics such as chromatic aberration and distortion aberration, Good optical performance can be achieved not only in the center of the field of view (FOV) but also in the periphery. Additionally, the optical systems 1000, 1100, 1200, and 1300 may have improved resolution. In addition, the meaning of the thickness of the lens at the optical axis (OA) and the distance between the adjacent lenses at the optical axis (OA) described in the equations may refer to the first to fourth embodiments disclosed above.

[Equation 1]

30 < |f1| < 120

In Equation 1, f1 means the focal length of the first lens (101, 201, 301, 401). For the performance of the optical system, the optical system can be set to have a shorter effective focal length compared to TTL. If Equation 1 is satisfied, the light incident from the object side to the first lens (101, 201, 301, 401) can be guided in the direction that converges from the optical axis, and if the refractive power of the first lens (101, 201, 301, 401) disposed closest to the object side is weak, the sensor Even if the difference from the Abbe number of the lens placed on the side is not large, chromatic aberration can be corrected. Additionally, the entire optical system may have a stable structure that spreads and collects light. In the first to fourth embodiments, preferably, 50 < |f1| < 115 can be satisfied.

[Equation 2]

10 < |F_LG1| < 30

In Equation 2, |F_LG1| means the focal length of the first lens group (LG1). The first lens group (LG1) refers to a lens group arranged on the object side based on the aperture (STOP). When the focal length of the first lens group LG1 satisfies Equation 2, the optical system can have good optical performance at the set angle of view. In the first to fourth embodiments, preferably, 15 < |F_LG1| < 30 can be satisfied.

[Equation 3]

20 < v1 < 60

In Equation 3, v1 is the Abbe number of the first lens (101, 201, 301, 401). In the optical system (1000, 1100, 1200, 1300), the total focal length of the first lens group (LG1) has a negative (-) sign, and the negative (-) focal length included in the first lens group (LG1) has a negative (-) sign. By setting the Abbe number of the first lens (101, 201, 301, 401) to be large, there is an effect of reducing chromatic aberration of the lens. In the first to third embodiments, Equation 3 may preferably satisfy 50 < v1 < 60, and in the fourth embodiment, Equation 3 may preferably satisfy 20 < v1 < 30.

[Equation 4]

45 < v2 < 60

In Equation 4, v2 is the Abbe number of the second lens (102, 202, 302, 402). In the optical system (1000, 1100, 1200, 1300), the total focal length of the first lens group (LG1) has a negative (-) sign, and the negative (-) focal length included in the first lens group (LG1) has a negative (-) sign. By setting the Abbe number of the second lens (102, 202, 302, 402) to be large, there is an effect of reducing chromatic aberration of the lens. In the first to fourth embodiments, Equation 4 may preferably satisfy 50 < v2 < 58.

[Equation 5]

15 < v5 < 25

In Equation 5, v5 is the Abbe number of the fifth lens (105, 205, 305, 405). In the optical system (1000, 1100, 1200, 1300), the total focal length of the second lens group (LG2) has a positive (+) sign, and is adjacent to the object side within the second lens group (LG2) and has a positive (+) sign. By setting the Abbe number of the fifth lens (105, 205, 305, 405) having a focal length low, there is an effect of reducing chromatic aberration of the lens disposed on the sensor side of the fifth lens (105, 205, 305, 405). In the first to fourth embodiments, Equation 5 may preferably satisfy 18 < v5 < 22.

[Equation 6]

0.1 < CG1 / ΣCG < 0.5

In Equation 6, CG1 is the center distance between the first lenses (101, 201, 301, 401) and the second lenses (102, 202, 302, 402), and ΣCG is the sum of the distances between adjacent lenses. If Equation 6 is satisfied, the light emitted from the first lens (101, 201, 301, 401), which has a large influence on the entire optical system, sets the optical path incident on the remaining lenses, and the optical system can have good optical performance at the set angle of view and focal distance. . In the first to fourth embodiments, Equation 6 may preferably satisfy 0.3 < CG1 / ΣCG < 0.5.

[Equation 7]

0.1 < CG1 / ΣCT < 0.3

In Equation 7, CG1 is the center distance between the first lenses (101, 201, 301, 401) and the second lenses (102, 202, 302, 402), and ΣCT is the sum of the center thicknesses of the lenses. If Equation 7 is satisfied, the light emitted from the first lens (101, 201, 301, 401), which has a large influence on the entire optical system, sets the optical path through which it is incident on the remaining lenses, and the optical system can have good optical performance at the set angle of view and focal distance. . In the first to fourth embodiments, Equation 7 may preferably satisfy 0.1 < ΣCT / ΣCG < 0.2.

[Equation 8]

0.01 < CG1 / TTL < 0.2

In Equation 8, CG1 is the center distance between the first lens (101, 201, 301, 401) and the second lens (102, 202, 302, 402), and is the distance from the center of the first surface (S1) of the first lens (101, 201, 301, 401) to the upper surface of the image sensor 500. The relationship between TTL, which is the distance (mm) from the optical axis (OA), can be set. If Equation 8 is satisfied, the light emitted from the first lens (101, 201, 301, 401), which has a large influence on the entire optical system, sets the optical path incident on the remaining lenses, and the optical system can have good optical performance at the set angle of view and focal distance. . In the first to fourth embodiments, Equation 8 may preferably satisfy 0.1 < CG1 / TTL < 0.15.

[Equation 9]

0.3 < ΣCT / TTL < 0.8

Equation 9 is the sum of the central thicknesses (ΣCT) of the first to seventh lenses (101-107, 201-207, 301-307, 401-407) and the image sensor 500 at the center of the first surface (S1) of the first lenses (101, 201, 301, 401). It is possible to set the relationship of TTL, which is the distance (mm) from the optical axis (OA) to the upper surface of ). To reduce TTL, a lot of light refraction must occur. In order to refract a lot of light, the power of the lenses must be increased, and to increase the power, the lenses become thicker. If it is less than the lower limit of Equation 9, the sum of the lens thicknesses becomes small and the refractive power becomes weak. If the upper limit of Equation 9 is exceeded, there is a problem in that the sum of the thicknesses of the lenses increases excessively, resulting in an increase in TTL. In the first to fourth embodiments, Equation 9 may preferably satisfy 0.5 < ΣCT / TTL < 0.8.

[Equation 10]

0.1 < ΣCG / TTL < 0.5

Equation 10 is the sum (ΣCG) of the spacing of adjacent lenses among the first to seventh lenses (101-107, 201-207, 301-307, 401-407) and the optical axis from the center of the first surface (S1) to the top surface of the image sensor 500. You can set the relationship between TTL, which is the distance (mm) in (OA). To reduce TTL, a lot of light refraction must occur. In order to refract a lot of light, the power of the lenses must be increased, and to increase the power, the lenses become thicker. If it is less than the lower limit of Equation 10, the sum of the lens thicknesses becomes small and the refractive power becomes weaker, making it weaker than the desired power. If the upper limit of Equation 10 is exceeded, there is a problem in that the sum of the thicknesses of the lenses increases excessively, resulting in an increase in TTL. In the first to fourth embodiments, Equation 10 may preferably satisfy 0.1 < ΣCG / TTL < 0.3.

[Equation 11]

3 < ΣCT / ΣCG < 4

In Equation 11, ΣCT is the sum of the central thicknesses of the lenses, and ΣCG is the sum of the spacing between adjacent lenses. If Equation 11 is satisfied, the optical system can have good optical performance at the set angle of view and focal length, and can reduce TTL. In the first to fourth embodiments, Equation 11 may preferably satisfy 3 < ΣCT / ΣCG < 3.5.

[Equation 12]

25 < ΣAbb / ΣIndex < 35

In Equation 12, ΣAbb means the sum of Abbe's numbers of each of the plurality of lenses, and ΣIndex means the sum of the refractive indices at the d-line of each of the plurality of lenses. If Equation 12 is satisfied, the optical systems (1000, 1100, 1200, and 1300) can have improved aberration characteristics and resolution. Optical characteristics can be controlled by using Equation 12 to set the sum of the Abbe numbers and refractive indices of the lenses. In the first to fourth embodiments, Equation 12 may satisfy 28 < ΣAbb / ΣIndex < 33.

[Equation 13]

1 < ΣCT / ΣET < 2

In Equation 13, ΣCT is the sum of the center thicknesses of the lenses, and ΣET is the end of the effective area of the lenses, that is, the sum of the edge thicknesses. If Equation 13 is satisfied, the optical system can have good optical performance at the set angle of view and focal length, and can reduce TTL. In the first to fourth embodiments, Equation 13 may preferably satisfy 1 < ΣCT / ΣET < 1.3.

[Equation 14]

0.5 < CT1 / ET1 < 1.5

In Equation 14, CT1 is the center thickness of the first lens (101, 201, 301, 401), and ET1 is the edge thickness of the first lens (101, 201, 301, 401). Through this, it is possible to set factors that affect the angle of view of the optical system and factors that affect the effective focal length (EFL). Equation 14 may preferably satisfy 0.7 < CT1 / ET1 < 1.2 in the first to fourth embodiments.

[Equation 15]

0.5 < GLCa_AVER/PLCa_AVER < 1.5

In Equation 15, GLCa_AVER represents the average effective diameter of glass lenses, and PLCa_AVER represents the average effective diameter of plastic lenses. The lens barrel on which the lens unit is disposed has at least one inner barrel within the lens barrel, and at least some of the plastic lenses included in the lens unit may be disposed in the inner barrel. In the case of plastic lenses, the amount of expansion is large at high temperatures, so more space is required within the lens barrel. By setting the effective diameter size of the glass lens and the effective diameter size of the plastic lens in Equation 15, deterioration of optical characteristics due to temperature changes can be suppressed, and the optical system (1000, 1100, 1200, 1300) can control the incident light. You can set the factors that affect aberration. In the first to fourth embodiments, Equation 15 may preferably satisfy 0.5 < GLCa_AVER/PLCa_AVER < 1.2.

[Equation 16]

1 < CA_L1S1 / CA_L1S2 < 2

In Equation 16, CA_L1S1 means the effective diameter of the first surface (S1) of the first lens (101, 201, 301, 401), and CA_L1S2 means the effective diameter of the second surface (S2) of the first lens (101, 201, 301, 401). If Equation 16 is satisfied, the deterioration of optical properties due to temperature changes can be suppressed, the optical system (1000, 1100, 1200, 1300) can control the incident light, and factors affecting aberration can be set. there is. In the first to fourth embodiments, Equation 16 may preferably satisfy 1 < CA_L1S1 / CA_L1S2 < 1.5.

[Equation 17]

0.5 < CA_L1 / CA_L7 < 1.5

In Equation 17, CA_L1 refers to the effective diameter of the first lens (101, 201, 301, 401), and CA_L7 refers to the effective diameter of the seventh lens (107, 207, 307, 407). The lens barrel on which the lens unit is disposed has at least one inner barrel within the lens barrel, and at least some of the plastic lenses included in the lens unit may be disposed in the inner barrel. In the case of plastic lenses, the amount of expansion is large at high temperatures, so more space is required within the lens barrel. Therefore, if Equation 17, which sets the relationship between the effective diameter of the first lenses (101, 201, 301, 401) made of glass and the effective diameter of the seventh lenses (107, 207, 307) made of plastic, is satisfied, the deterioration of optical properties due to temperature changes can be suppressed. The optical systems (1000, 1100, 1200, and 1300) can control incident light and set factors affecting aberration. In the first to fourth embodiments, Equation 17 may preferably satisfy 0.8 < CA_L1 / CA_L7 < 1.2.

[Equation 18]

1 < CA_L1 / ImgH < 2.5

Equation 18 can establish the relationship between the size of the effective diameter (CA_L1) of the first lens (101, 201, 301, 401) and ImgH is the maximum diagonal length of the image sensor. If Equation 18 is satisfied, the TTL suitable for the vehicle optical system is satisfied and the set angle of view can be satisfied. If it is less than the lower limit of Equation 18, the effective diameter of the lens disposed in the optical system (1000, 1100, 1200, 1300) becomes the largest, which causes a problem in that the TTL becomes longer. If the upper limit of Equation 18 is exceeded, there is a problem that the angle of view becomes too large than the angle of view satisfied by the optical system (1000, 1100, 1200, 1300). In the first to fourth embodiments, Equation 18 may preferably satisfy 1.8 < CA_L1 / ImgH < 2.2.

[Equation 19]

1 < CT_Max / CG_Max < 2

In Equation 19, CT_Max is the maximum central thickness among the lenses, and CG_Max is the maximum spacing between adjacent lenses. If Equation 19 is satisfied, the optical system can have good optical performance at the set angle of view and focal distance, and can reduce TTL. In the first to fourth embodiments, Equation 19 may preferably satisfy 1.2 < CT_Max / CG_Max < 2.

[Equation 20]

1 < CA_max / CA_min < 2

In Equation 20, CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses, and CA_Min represents the minimum effective diameter among the object sides and sensor sides of the lenses. If Equation 20 is satisfied, the optical system can maintain optical performance and set the size for a slim and compact structure. In the first to fourth embodiments, Equation 20 may preferably satisfy 1.2 < CA_max / CA_min < 1.5.

[Equation 21]

1 < CA_max / CA_Aver < 2

In Equation 21, CA_max represents the maximum effective diameter of the object sides and sensor sides of the lenses, and CA_Aver represents the average of the effective diameters of the object sides and sensor sides of the lenses. If Equation 21 is satisfied, the optical system can maintain optical performance and set the size for a slim and compact structure. In the first to fourth embodiments, Equation 21 may preferably satisfy 1 < CA_max / CA_Aver < 1.5.

[Equation 22]

0.5 < CA_min / CA_Aver < 1

In Equation 22, CA_Min represents the minimum effective diameter among the object sides and sensor sides of the lenses, and CA_Aver represents the average of the effective diameters of the object sides and sensor sides of the lenses. If Equation 22 is satisfied, the optical system can maintain optical performance and set a size for a slim and compact structure. In the first to fourth embodiments, Equation 22 may preferably satisfy 0.7 < CA_min / CA_Aver < 0.9.

[Equation 23]

2 < CA_max / ImgH < 3

In Equation 23, CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses, and Imgh represents 1/2 of the maximum diagonal length of the image sensor 500. If Equation 23 is satisfied, the optical system can maintain good optical performance and set a size for a slim and compact structure. In the first to fourth embodiments, Equation 23 may preferably satisfy 2 < CA_max / ImgH < 2.5.

[Equation 24]

25 < TTL < 32

In Equation 24, TTL (Total track length) means the distance (mm) from the center of the first surface (S1) of the first lens (101, 201, 301, 401) to the upper surface of the image sensor 500 on the optical axis (OA). If Equation 24 is satisfied, a suitable automotive optical system can be provided. In the first to fourth embodiments, equation 24 may preferably satisfy 28 < TTL < 31.

[Equation 25]

5 < ImgH < 6

In Equation 25, ImgH means 1/2 of the maximum diagonal length of the image sensor 500. Equation 25 can set the diagonal size (ImgH) of the image sensor 500 and provide an optical system having a sensor size for a vehicle. In the first to fourth embodiments, Equation 25 may preferably satisfy 5 < ImgH < 5.5.

[Equation 26]

3 < BFL < 4

In Equation 26, BFL is the optical axis distance from the image sensor 500 to the center of the sensor side of the last lens. If Equation 26 is satisfied, installation space for the filter 600 and cover glass can be secured, assembly of components can be improved through the gap between the image sensor 500 and the last lens, and coupling reliability can be improved. . In the first to fourth embodiments, Equation 26 may preferably satisfy 3 < BFL < 3.5. If the BFL is less than the range of Equation 26, some of the light traveling to the image sensor may not be transmitted to the image sensor, which may cause resolution deterioration. If the BFL exceeds the range of Equation 26, stray light may enter and the aberration characteristics of the optical system may deteriorate.

[Equation 27]

9 < F < 12

Equation 27 can set the overall focal length (F) to suit the vehicle optical system. In the first to fourth embodiments, Equation 27 may satisfy 10 < F < 11.

[Equation 28]

40 < FOV_H < 60

In Equation 28, FOV_H refers to the horizontal angle of view (Degree) of the optical system (1000, 1100, 1200, 1300), and can provide an angle of view suitable for the vehicle optical system. In the first to fourth embodiments, 45 < FOV_H < 50 may be preferably satisfied.

[Equation 29]

2 < TTL / CA_max < 3

In Equation 29, CA_max refers to the largest effective diameter (mm) among the object side and sensor side of the plurality of lenses, and TTL (Total track length) refers to the image from the vertex of the first surface (S1) of the first lens (101, 201, 301, 401). It means the distance (mm) from the optical axis (OA) to the upper surface of the sensor 500. Equation 29 establishes the relationship between the total optical axis length of the optical system and the maximum effective diameter, thereby providing an improved optical system for vehicles. In the first to fourth embodiments, Equation 29 may preferably satisfy 2.5 < TTL / CA_max < 2.7.

[Equation 30]

5 <TTL/ImgH<7

In Equation 30, TTL (Total track length) means the distance (mm) on the optical axis (OA) from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor 500, and ImgH is the image It means 1/2 of the maximum diagonal length of the sensor 500. When Equation 30 is satisfied, the optical systems 1000, 1100, 1200, and 1300 can have a TTL for application to the automotive image sensor 500, thereby providing improved image quality. In the first to fourth embodiments, equation 30 may preferably satisfy 5 < TTL / ImgH < 6.

[Equation 31]

0.5 <BFL/ImgH<1

In Equation 31, BFL is the optical axis distance from the image sensor 500 to the center of the sensor side of the last lens, and ImgH is 1/2 of the maximum diagonal length of the image sensor 500. If Equation 31 is satisfied, the optical system (1000, 1100, 1200, 1300) can secure the BFL (Back focal length) to apply the size of the vehicle image sensor 500, and the last lens and image sensor 500 The distance between them can be set, and good optical characteristics can be achieved in the center and periphery of the field of view (FOV). In the first to fourth embodiments, Equation 31 may preferably satisfy 0.5 < BFL / ImgH < 0.7.

[Equation 32]

7 <TTL/BFL<10

Equation 32 shows that TTL (Total track length) means the distance (mm) on the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201, 301, 401) to the upper surface of the image sensor 500, BFL refers to the optical axis distance from the image sensor 500 to the center of the sensor side of the last lens. If Equation 32 is satisfied, the optical system (1000, 1100, 1200, 1300) can secure BFL. In the first to fourth embodiments, Equation 32 may preferably satisfy 7 < TTL / BFL < 9.

[Equation 33]

2 < TTL / F < 3

In Equation 33, TTL (Total track length) means the distance (mm) on the optical axis (OA) from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor 500, and F is the optical system is the effective focal length of Accordingly, an optical system for a driver assistance system can be provided. If the optical system (1000, 1100, 1200, 1300) according to the embodiment satisfies Equation 33, the optical system (1000, 1100, 1200, 1300) can have an appropriate focal length in the set TTL range, and the temperature range from low to high temperature. Provides an optical system that can form images while maintaining an appropriate focal distance even as the If it is less than the lower limit of Equation 33, it is necessary to increase the refractive power of the lenses, making correction of spherical aberration or distortion aberration difficult, and if it is more than the upper limit of Equation 33, the effective diameter or TTL of the lenses becomes longer, making it difficult to capture images. A problem may arise where the lens system becomes larger. In the first to fourth embodiments, Equation 33 may preferably satisfy 2.5 < TTL / F < 3.

[Equation 34]

3 < F/BFL < 4

In Equation 34, F is the effective focal length of the optical system, and BFL is the optical axis distance from the image sensor 500 to the center of the sensor side of the last lens. If Equation 34 is satisfied, the optical systems 1000, 1100, 1200, and 1300 can have a set angle of view and an appropriate focal length, and an optical system for a vehicle can be provided. Additionally, the optical systems 1000, 1100, 1200, and 1300 can minimize the gap between the last lens and the image sensor 500, so that they can have good optical characteristics at the periphery of the field of view (FOV). In the first to fourth embodiments, Equation 34 may preferably satisfy 3 < F / BFL < 3.5.

[Equation 35]

2 < F/ImgH < 3

In Equation 35, F is the effective focal length of the optical system, and ImgH means 1/2 of the maximum diagonal length of the image sensor 500. These optical systems (1000, 1100, 1200, and 1300) may have improved aberration characteristics in the size of the vehicle image sensor 500. In the first to fourth embodiments, Equation 35 may preferably satisfy 2 < F / ImgH < 2.5.

[Equation 36]

In Equation 36, Z is Sag and can mean the distance in the optical axis direction from an arbitrary position on the aspherical surface to the vertex of the aspherical surface. Y may mean the distance from any location on the aspherical surface to the optical axis in a direction perpendicular to the optical axis. c may refer to the curvature of the lens, and K may refer to the Conic constant. Additionally, A, B, C, D, E, and F may mean aspheric constants.

The optical systems 1000, 1100, 1200, and 1300 according to the first to fourth embodiments may satisfy at least one or two of Equations 1 to 36. In this case, the optical systems 1000, 1100, 1200, and 1300 may have improved optical characteristics. In detail, if the optical system (1000, 1100, 1200, 1300) satisfies at least one or two of Equations 1 to 36, the optical system (1000, 1100, 1200, 1300) has improved resolution and reduces aberration and distortion. Characteristics can be improved. In addition, the optical systems (1000, 1100, 1200, and 1300) can secure the back focal length (BFL) for applying the automotive image sensor 500, compensate for the degradation of optical characteristics due to temperature changes, and the last lens The gap between the image sensor 500 and the image sensor 500 can be minimized, allowing good optical performance in the center and periphery of the field of view (FOV).

Table 13 shows the result values for Equations 1 to 35 described above in the optical systems (1000, 1100, 1200, and 1300) of the example. Referring to Table 13, it can be seen that the optical systems 1000, 1100, 1200, and 1300 satisfy at least one, two, or three of Equations 1 to 35. In detail, it can be seen that the optical systems 1000, 1100, 1200, and 1300 according to the embodiment satisfy all of Equations 1 to 35. Accordingly, the optical systems 1000, 1100, 1200, and 1300 can have good optical performance and excellent optical characteristics in the center and periphery of the field of view (FOV).

math equation		Embodiment 1	Second embodiment	Third embodiment	Embodiment 4
One	30 < |f1| < 120	51.151	52.963	73.639	111.274
2	10 < |F_LG1| < 30	17.904	21.283	22.077	29.521
3	20 < v1 < 60	55.179	55.179	55.179	24.039
4	45 < v2 < 60	55.707	55.707	55.707	55.707
5	15 < v5 < 25	21.213	21.213	21.213	20.379
6	0.1 < CG1 / ΣCG < 0.5	0.417	0.392	0.388	0.467
7	0.1 < CG1 / ΣCT < 0.3	0.120	0.105	0.127	0.149
8	0.01 < CG1 / TTL < 0.2	0.083	0.074	0.085	0.100
9	0.3 < ΣCT / TTL < 0.8	0.688	0.700	0.665	0.672
10	0.1 < ΣCG / TTL < 0.5	0.199	0.188	0.218	0.214
11	3 < ΣCT / ΣCG < 4	3.463	3.726	3.045	3.138
12	25 < ΣAbb / ΣIndex < 35	32.783	32.783	32.783	28.443
13	1 < ΣCT / ΣET < 2	1.133	1.107	1.122	1.130
14	0.5 < CT1 / ET1 < 1.5	0.843	0.812	0.889	1.062
15	0.5 < GLCa_AVER/PLCa_AVER < 1.5	0.986	1.053	0.994	0.978
16	1 < CA_L1S1 / CA_L1S2 < 2	1.197	1.185	1.200	1.227
17	0.5 < CA_L1 / CA_L7 < 1.5	0.935	1.079	0.987	0.962
18	1 < CA_L1 / ImgH < 2.5	1.907	2.001	1.976	1.970
19	1 < CT_Max / CG_Max < 2	1.918	1.812	1.675	1.377
20	1 < CA_max / CA_min < 2	1.404	1.358	1.389	1.357
21	1 < CA_max / CA_Aver < 2	1.183	1.185	1.153	1.138
22	0.5 < CA_min / CA_Aver < 1	0.842	0.872	0.830	0.839
23	2 < CA_max / ImgH < 3	2.292	2.279	2.227	2.171
24	25 < TTL < 32	29.995	30.000	30.000	29.995
25	5 < ImgH < 6	5.145	5.145	5.145	5.145
26	3 < BFL < 4	3.416	3.375	3.495	3.404
27	9 < F < 12	10.878	10.863	10.884	10.881
28	40 < FOV_H < 60	46.00	46.00	46.00	46.00
29	2 < TTL / CA_max < 3	2.543	2.558	2.618	2.685
30	5 <TTL/ImgH<7	5.830	5.831	5.831	5.830
31	0.5 <BFL/ImgH<1	0.664	0.656	0.679	0.662
32	7 <TTL/BFL<10	8.781	8.888	8.585	8.811
33	2 < TTL / F < 3	2.757	2.762	2.756	2.757
34	3 < F/BFL < 4	3.184	3.219	3.115	3.196
35	2 < F/ImgH < 3	2.114	2.111	2.115	2.115

Figure 49 is an example of a top view of a vehicle to which a camera module or optical system is applied according to an embodiment of the invention. Referring to FIG. 49, the vehicle camera system according to an embodiment of the invention includes an image generator 11, a first information generator 12, and a second information generator 21, 22, 23, 24, 25, and 26. ) and a control unit 14. The image generator 11 may include at least one camera module 31 disposed in the host vehicle, and can generate a front image of the host vehicle or an image inside the vehicle by filming the front of the host vehicle and/or the driver. there is. The image generator 11 may use the camera module 31 to capture not only the front of the vehicle but also the surroundings of the vehicle in one or more directions to generate an image surrounding the vehicle. Here, the front image and peripheral image may be digital images and may include color images, black-and-white images, and infrared images. Additionally, the front image and surrounding image may include still images and moving images. The image generator 11 provides the driver image, front image, and surrounding image to the control unit 14. Next, the first information generating unit 12 may include at least one radar or/and a camera disposed in the host vehicle, and generates first detection information by detecting the front of the host vehicle. Specifically, the first information generator 12 is disposed in the host vehicle and generates first detection information by detecting the location and speed of vehicles located in front of the host vehicle and the presence and location of pedestrians.

Using the first detection information generated by the first information generator 12, the distance between the own vehicle and the vehicle in front can be controlled to maintain a constant distance, and when the driver wants to change the driving lane of the own vehicle or reverse parking, The stability of vehicle operation can be improved in certain preset cases, such as when driving. The first information generation unit 12 provides first detection information to the control unit 14. The second information generators 21, 22, 23, 24, 25, and 26 are based on the front image generated by the image generator 11 and the first sensed information generated by the first information generator 12, Each side of the vehicle is sensed to generate second sensing information. Specifically, the second information generators 21, 22, 23, 24, 25, and 26 may include at least one radar or/and camera disposed on the host vehicle, and may include positions of vehicles located on the sides of the host vehicle. and speed can be detected or video taken. Here, the second information generation units 21, 22, 23, 24, 25, and 26 may be disposed at both front corners, side mirrors, and the rear center and rear corners of the vehicle, respectively.

At least one information generator of these vehicle camera systems may include an optical system described in the above-described embodiment and a camera module having the same, and may use information acquired through the front, rear, each side, or corner area of the vehicle. It can be provided to the user or processed to protect vehicles and objects from autonomous driving or ambient safety.

The optical system of the camera module according to an embodiment of the invention can be mounted in multiple numbers in a vehicle to improve safety regulations, strengthen autonomous driving functions, and increase convenience. Additionally, the optical system of the camera module is used in vehicles as a control component for lane keeping assistance systems (LKAS), lane departure warning systems (LDWS), and driver monitoring systems (DMS). These automotive camera modules can provide stable optical performance despite changes in ambient temperature and provide price-competitive modules to ensure the reliability of automotive components.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description has been made focusing on the examples, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiment. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

Claims (10)

1. It includes first to seventh lenses arranged along the optical axis,

   The first lens has negative refractive power,

   The second lens has negative refractive power,

   The third lens has positive (+) refractive power,

   The fourth lens has positive (+) refractive power,

   The fifth lens has negative refractive power,

   The sixth lens has positive refractive power,

   The seventh lens has negative refractive power,

   An aperture is disposed between the second lens and the third lens,

   An optical system in which the third lens has the largest thickness among the first to seventh lenses on the optical axis.
2. According to paragraph 1,

   At least one of the first lens and the third lens is made of glass,

   An optical system in which at least one of the second lens and the fourth to seventh lenses is made of plastic.
3. According to paragraph 1,

   At the optical axis, the sixth lens has a convex shape on both sides,

   An optical system in which the seventh lens has a meniscus shape convex toward the object on the optical axis.
4. According to paragraph 1,

   An optical system in which the absolute value of the focal length of the first lens among the first to seventh lenses is the largest.
5. According to paragraph 1,

   An optical system wherein, from the optical axis to the effective diameter area, the maximum distance between two lenses with the largest Abbe number difference among adjacent lenses is smaller than the maximum distance between the other two adjacent lenses.
6. According to paragraph 1,

   The fourth lens and the fifth lens are an optical system in which the difference in Abbe number is the largest among adjacent lenses.
7. According to any one of claims 1 to 6,

   An optical system that satisfies the condition below.

   <Conditional expression>

   40 < FOV_H < 60

   (FOV_H in the above conditional expression refers to the horizontal angle of view of the optical system.)
8. According to any one of claims 1 to 6,

   An optical system that satisfies the condition below.

   <Conditional expression>

   0.3 < CG1 / ΣCG < 0.5

   (In the above conditional expression, CG1 is the distance between the first lens and the second lens on the optical axis, and ΣCG is the sum of the intervals between adjacent lenses on the optical axis.)
9. According to any one of claims 1 to 6,

   An optical system that satisfies the condition below.

   <conditional expression>

   5 <TTL/ImgH<7

   (In the above conditional expression, TTL is the distance on the optical axis from the vertex of the object side of the first lens to the upper surface of the image sensor, and ImgH is 1/2 of the maximum diagonal length of the image sensor.)
10. It includes first to seventh lenses arranged along the optical axis,

    The second lens has negative refractive power,

    The third lens has positive (+) refractive power,

    The fourth lens has positive (+) refractive power,

    The fifth lens has negative refractive power,

    The sixth lens has positive refractive power,

    The seventh lens has negative refractive power,

    Among the first to seventh lenses, the effective diameter of the second lens is the smallest,

    An optical system in which the fourth lens has the largest effective diameter among the first to seventh lenses.

Images